Yeah, but they hurt. The SBA3 has a QD point to attach a sling. The SBA3 is far more comfortable.
I would rather spend the money and get the SB Tactical. The Shockwave would be a decent option for PCC, but not for 5.56mm.
I think it's great for a plinker. I love it, but to your point, I haven't shot more than a few mags in an outing..