Had to join MGS since I enjoyed the initial Swing Trainer Shootout. Great job Matt and look forward to your update!
strolf has a good list going so here are my thoughts:1. Hardware and software
Since these swing trainers are technology devices, it would be helpful if the review of each device is broken down based on i) hardware and ii) software. On hardware, a listing of the specific sensors, gyros, accelerometers being used after all, there are limitations on what a sensor can read, obsolete tech, lifespan, build quality, and durability in indoor / outdoor conditions. Also, details on stability, mounting effectiveness on particular steel, graphite shafts, and the diameter of shafts used in testing. On software, you can break it down based on UI, information displayed on Android, iOS devices (iPad, iPhone). Hardware is a fixed cost, but software can be improved with new app updates.2. Accuracy compared to TrackMan
TrackMan is the PGA standard so if the data is off by x% then the results will be misleading. Testing should include outdoor grass conditions with golf balls, indoor mats with foam balls and no balls / brushing off the matt since a number of folks in the northeast will be relying on these swing trainers when winter rolls around. A primer on important metrics to look for in analyzing swings would be helpful for newbies.3. Swing analyzers should encompass full swings to putting strokes
PING has the iPing cradle, app that utilizes the sensors in an iPhone, iPod. Rather than attaching a bulky device to your putter that alters the putter's swingweight, these lightweight swing trainers should be able to detect tempo, face angles, and transmit those results to your mobile device. Please add the iPing to the list.4. Add the Noitom MySwing Golf Swing Analyzer to the list
Golfsmith has some positive reviews so may be a worthy contender.5. Pre and post-sales support
These devices are not inexpensive and should last more than one season. A lot can happen with technology products. A company that is responsive to customer feedback / requests and acknowledges issues and stands behind their product wins my dollars.