I got one of those funny orange polymer targets a few weeks ago. This was an inexpensive Winchester brand spinner from Walmart. I don't remember how many hits this was rated for, but the larger targets are good for 5-10k hits from 17-50 caliber. Skeptical, yes. After a day at the range this light weight target took hits from 22, 556, and 9mm. The 556 had a pinhole entry and exited with a slightly larger ball point pen size hole. 22 and 9 had more inconsistent holes. Plenty enough drag to spin the target, only lacking the positive gong of a metal target. But the $15-$40 price point and the reduced weight will have me buying more.
edit: Don't shoot these targets with a pellet gun (like the package says)! Will bounce back almost directly at you, thankfully with much less energy.