I think he's a member here and from what I've heard they work great. Been wanting one for my AR
I bought one from Vince, and he delivered on time for the holiday weekend!
We had 7 of the family clan working the new toy, from age 7 to age 68. Consensus was that the launcher was a solid "10" in the fun factor on a 1-10 scale, 10 being the highest. It was also a "1" on issues of practicality and accuracy! Really wasn't much in the terms of practicality and accuracy, but, man, did we have a great time playing around with it. We went through 40 golf balls and 40 blanks real fast. Didn't have a 500 yard range to test out the ultimate range, but did discover that it gave us 350 on a regular basis. We found that a bit of a "patch" around the golf ball helped a bit in accuracy. We started with a single square of toilet paper; then went to 2 squares; then a 12 gauge shotgun cleaning patch. All the patches improved the accuracy, and the 12 gauge patch was the most effective.
We're looking forward to the next rendezvous with 100 blanks and golf balls to play round with.