I use the G5 Montec. I would like to see how they stack up against some of the other broadheads on the market. It seems to be a very durable piece of gear. One thing I have noticed is the noise they make flying through the air. They make a good deal more noise than other blade as they zip through the air.
I have also noticed that noise when shooting them, but I mic'd up a camera down range and couldn't tell much difference when compared to field points while being on the "receiving" end.