I have shot the Montecs for the last 2 years.
They fly great and group out to 80 yards (messing around in hunting camp). Penetration is excellent, however you do need to sharpen them. As far as practice goes, get the preseason heads, or use some of the heads that got dinged up last hunting season.

While I will still most likely use the Montecs this year, I have been looking at the Simmons Razor Sharks. I just picked up a pack from my local shop and wow. Those main blades are the thickest I have seen (.050), with the exception of the German Kinetics Silver Flames.