I looked around the forum and didn’t see any reviews or mentions of this product so I figure I will take the time to share my experience thus far.
I switched all my grips to JumboMax JMX ultralight grips. I did this for a few reasons. The most pressing reason was a recent bout of tennis elbow that I knew had come on due to me gripping the club too firmly as well as doing speed training. I was gripping the clubs so firmly because I could still feel the grip moving around despite using a midsize grip. Also, I had a tendency to pull all my shots. I was getting a little handsy and closing my club face through impact. Bad miss was a snap hook. I knew larger grips would prevent this. I played five rounds with these grips and was about to give up. Started to believe I made a dumb decision and wasted $200. Went as far as buying new grips to replace them.
Decided to play a few more rounds since I spent what I did on them and was very glad that I did. I have seen a 15 yard increase in my total distance, no longer suffering from tennis elbow and no longer pulling shots. I do strongly believe it takes time to adjust to these larger grips. I think if you are a club golfer playing frequently, it’s not as big of a deal as someone playing a handful of rounds a year. At this point, I’m four months in and I strongly recommend giving this product a try if you are suffering from some of the problems I mentioned. Swing weight is great because the grips way less than a standard midsize grip. Now flushing all my clubs, accurately.