Ive put over 25k rounds through mine, I can't kill the damn thing. I got it after one of the gun mags boasted that they'd put 10k rounds through it without cleaning and it still going strong. I thought surely this is some Glock fanboy BS. I was proven wrong.
There may be better options if you've got specific requirements, but its a great trainer, and good for beginners.
The ProMag 18rd magazines are terrible though, if you're looking for increased capacity.