My main complaint with IPL's pre launch events were just the fact we couldn't use our own controllers/arcade sticks due to the room of the event. I don't expect that to happen at the official IPL events coming up though, so not worried in that regard.
That's my only main complaint because again, I use arcade stick and it can be used on both systems with the same input issues I have with it. Only differing factor is the 1 frame delay of the PS3, but to me, when you're talking between a 7 and 8 frame total delay between the 360 and the PS3 respectively, it's really negligible. You can practically adjust to it in 15 minutes time. Obviously, the system issue is more about the default controller than it is about the added delay on the PS3. If it were about the delay then you would already have heard an announcement of it being on Xbox 360, and all other major fighting game events would have switched to 360 for at least the top two major games: SF4 and MVC3U.