I find Grado's VERY uncomfortable with the L-cush pads. It actually hurts my right ear. That may be related to the fact I wear glasses. I tried knock off G-cush pads and the comfort was better, but I didn't like the sound. Finally I dropped the big money (to me), on the Beautiful Audio pads and life has been good ever since.
I hear you on the constant whining on that thread. Now go back through and look at it again, but this time note how many actual people had a problem. And then note how many posts start with "I read...", "I heard...", "A buddy/trusted source said..."
I would bet their success rate is well above 95%, which is pretty good for a smallish company.
Personally I have experienced no problems in my current and previous ownership. Now I must run and knock on some wood.