I have a dueling tree (six targets) that I bought from Gander Mtn in the store for ~$100. I've shot everything from .22 (which won't swing it) to .44 mag (which will) at it over the last year and I've never noticed any damage structurally.

I don't think it's top of the line and I don't use it all the time due to the fact that it's annoying to lug out to the range but when I've used it, I've been very happy.

I bought it on impulse (Do-All Traps 9mm - 30/06 Caliber Steel Roundup Dueling Tree Target - I think that's the one) and after doing a little research, it gets pretty mixed reviews. Most of the negatives focus on heavier use or higher calibers but some just cite the inexpensive materials of construction. I doubt it would be reliable enough for extended, heavy use. For my occasional sessions, it's just about right and I won't fee like I threw my money down the drain if it were to break the next time out.

I suspect that this is not a "buy once, cry once" type product that I've got.