I'm sorry you had poor service out of them. I had excellent CS with them. I had to send first upper back and they sent me a new upper before receiving the old back. they also paid for the shipping and waited over a month to get it back.
For me it is mainly the price stand point. I don't really know if it is actually bad for the gun, and you will get varying answers on the subject just like which AR to by and why it has to be this and that.

