Guys... look at the poll though. This board's viewership *easily* peaks at 350-450+ people (which probably translates into 1,000 or even 1,500 active accounts). Then consider this... You're probably much less likely to vote in a poll like this (or even open the thread) if 135 is kicking your ass. Taking that all into consideration, the fact that only 21 guys have votes (at this time) that they do 315 (3 wheels/side) or more is pretty remarkable.
I'd think that in any serious gym (read: no leg warmers, geriatric patients or tennis wives) that at least 10% of the male, acvite members could get 3 wheels up for one rep with reasonably good form. In a hard-core gym, I bet that number spikes up to 35% or more.