Mine is freshly built, so no I don't have a huge number of rounds..nor do I rappel from helos, do HALO jumps, kick in doors or exit Submarines off the coast of China...well except on the Xbox..
Nor are my guns safe queens...none of my guns are safe queens....they all get shot and get some rough handling.
I have about 55 rounds through my upper with the YHM machine YHM9432A customizable tube. I paid $81.25, with my Brownell's discount...
I do not need the DD or the Larue tubes...I did want a tube that in the future I could add rails if needed, something I could not do with a tube like the Hogue, Accuracy Speaks or the FA Enterprises tubes.
If I was going to the sandbox would I take YHM product? I don't know, maybe, if I knew of someone that had used them over there. I would stick to manufactures that I know are used over there, picking which ones based on first hand accounts.
With that said, I'm not going to combat, unless the dead come to life or we are invaded by Martians.
I like YHM stuff that I have...so far...after a few hundred rounds that may change, but right now, I'm happy with my choice.