The results of the My Golf Ball ball study generated a lot of discussion and also questions as a result.  If one of those questions you had is, which model of Srixon ball will work best for me, the Z Star or the Z Star XV, then we may the answer for you.
Four of our members were sent a dozen of each, and will be putting them in play on the course and putting green over the next 4  to 5 weeks to see which one works best for them.  They will report in regularly along the way with results form both.  So feel free to chime in with questions and read both their stage reviews to get their full thoughts. 

Our Four Testers Are:
@Reesedw               Stage 1                  Stage 2
@pulledabill             Stage 1                  Stage 2
@ChasingScratch    Stage 1                  Stage 2
@golfertrb                Stage 1                 Stage 2

This is seriously fun thing by Volvik.   The following is a press release.
 
ORLANDO, Florida (May 1, 2019) – Volvik (volvik.com), known the world over for its high performance golf balls featuring more than 23 vibrant color options, reports record-setting sales of the Marvel x Volvik collaboration of Captain America, Ironman and Spider Man Vivid 4-Ball Sets. Since the release of the widely anticipated Disney film Avengers: Endgame in U.S. theatres April 26, demand for the golf ball sets has been extraordinary. The film, setting box-office records, already is the highest-grossing film of the year and the 10th highest-grossing film of all time. Since the movie’s release Volvik has witnessed unprecedented demand from golfers, retailers and pro shops across the country for the Marvel special edition sets.
“Since the premier of Avengers: Endgame, demand for the Captain America, Ironman and Spider Man Vivid 4-Ball Sets has exceeded our most aggressive forecasts,” said Don Shin, president of Volvik USA. “The response to the introduction of our Marvel Collaboration has been extremely robust.
 
“We feel fortunate to have such a strong relationship with the Marvel team and look forward to continued success.”
 
The Volvik Vivid high-performance three-piece oversized matte-finish golf ball is the product platform for the Marvel Collaboration of Captain America, Ironman and Spider Man. Each set comes in a custom-designed package with four Marvel decorated Vivid balls featuring Captain America, Ironman and Spider Man logos, as well as a magnetic hat clip and custom-tooled ball marker. Each four-ball set retails at $24.99. The sets can be purchased directly on Volvik.com or by calling 407-649-0013. Pro shops and retailers may order the sets from their local Volvik representatives.
 
The limited-edition sets are the first step in a series of Volvik product introductions that will continue throughout 2019 and beyond.
 
Marvel Worldwide Inc. is a publisher of American comic books and related media. In 2009, The Walt Disney Company acquired Marvel Entertainment, Marvel Worldwide’s parent company.

About Volvik
Golfers everywhere are discovering Volvik, the founder of the matte-finish golf ball and maker of the #1 matte-finish VIVID ball. With a tagline of “Change the Game,” Volvik is making golf fun again. Young golfers are increasing their engagement with the game because they love the Volvik colors, while experienced players are realizing that Volvik, “not just a pretty face,” manufactures golf balls that provide players with power, distance, precision and control.
 
With over 40 years of golf ball production, Volvik has led the way with unparalleled innovation, rapidly becoming one of the most significant and trusted golf ball manufacturers in the world.
 
Volvik is dedicated to the production of specialized 3- and 4-piece multi-layer high performance golf balls for players of every skill set, featuring 58 worldwide patents. Volvik’s patented SF matte coating has led to the development of Vivid, the world’s first matte finish golf ball.
 
Volvik recently expanded its best-selling Vivid matte finish golf ball product line with two new golf balls. Vivid Soft and Vivid Lite have been added to Vivid and Vivid XT, making the Vivid product line the largest selection of matte finish golf balls, with the ability to fit every type of player.
 
Volvik's product line portfolio has been in use on the world's professional tours since 2012. Players using Volvik golf balls have earned millions of dollars in prize money on the PGA TOUR, LPGA Tour, Champions Tour, Web.com Tour, Ladies European Tour, LAGT and Symetra Tour, with multiple victories. The Volvik Vivid XT is the official golf ball of the World Long Drive Association tour, and Volvik is the title sponsor of the Volvik World Long Drive Championship. The Vivid XT provides high visibility from Volvik’s patented SF matte coating, and explosive distance and power from its patented dual core technology.
 
For more information, see volvik.com.

Official Forum Member Reviews

 
Snell MTB Black & MTB Red
 
MTB Black:
 
03trdblack                           Stage 1     Stage 2
HighontheHog                     Stage 1     Stage 2
Theedpatt                           Stage 1     Stage 2
dhartmann34                      Stage 1     Stage 2
Derek666                            Stage 1     Stage 2
 
MTB Red:
 
kingcscott                            Stage 1     Stage 2
Rickp                                   Stage 1     Stage 2
MaxEntropy                         Stage 1     Stage 2
golfergirl1                            Stage 1     Stage 2
PING Apologist #9               Stage 1     Stage 2

Fixin' to order up a fresh batch of MTB Blacks and noticed that Snell has several models on sale right now if interested... $150/6-doz which is $25 per dozen, or single dozen boxes at only $26.99 each! Delivered! NO TAX! Sweet deal for us Snell honks!
https://www.snellgolf.com/
https://www.snellgolf.com/products/mtb-black-value-pack-6-dozen?variant=4722119311401
https://www.snellgolf.com/products/mtb-red-value-pack-6-dozen?variant=4722172887081