I also just have a few heads that I use for practice. And, the replacement blades are cheap, so you can always keep those on hand as well.
As for blood trails, they are very impressive. They do some serious damage. There is not a head out there that is more durable, and no need to worry about blades breaking when passing through an animal, retaining its full cutting surface on entry and exit. I've had several hits through ribs on both sides with not so much as a scuff on the blade. I've also not shot a head that gets pass throughs like a Slick does. It seems somewhat counter-intuitive because the originals (which I have more experience with) are non a COC head, which we usually associate with pass throughs, or low poundage bows. My wife shoots 42 pounds and shoots original slicks in 100 grain and has passed through all three deer she has shot. I could get a pass through with a blunt tip, shooting 585 grains at ~273 fps, so my experience on pass throughs may be a bit skewed.