Hi everyone, I'd appreciate some input regarding OPlayer vs AVPlayer for the iPhone 4S (don't have yet, planning to buy one soon). I downloaded the free version of OPlayer to try on my 3GS and iPad 2, and to my surprise found playback of simple AVI movies (non HD) in the range of 700mb - 1.4gb to be slightly, but noticeablely, choppy (more so on the 3GS). It's a slight choppiness throughout, rather than random hiccups. So I'm wondering if this is to be expected of AVPlayer (paid version) as well? Is the paid version of OPlayer better? I'm seeing people saying they can run 720P MKVs on iPad 2 perfectly smooth, and I don't understand why I'm seeing such bad performance. Any insight would be greatly appreciated!