There was a discussion about this over on the mathew's forum.

http://forums.mathewsinc.com/viewtopic.php?t=81852

The consensus was that it is way too heavy (around 64 grains for the standard size) and cost too much (about $17 and the mini is about $23) for anyone to even consider using. A properly set up and sized G5 or tru-peep just can't be beat.