Question on slick tricks...do they have practice heads, or do you simply resharpen the actual broadheads after shooting them into a target? I have considered trying them, but wondered about that. Also, what do you all use to resharpen them to get them as sharp as factory? I have tried sharpening heads and can never seem to get them quite as sharp as I would like them...i like hairs to pop off my arm when seeing how sharp they are. I use Muzzy's now and like how you can simply buy replacement blades, but so many of the ones I admire most on here rave about Slick Tricks, leading me to think that there must be good reason to consider them.