I've played through the PS3 remasters a few times now and have yet to experience any glitches or technical issues. The only problem (if you want to call it that ) is in KH2 when you shift drive forms and the game has to load for a few seconds, rather than it being instantaneous like the original PS2 version. Other than that, they've all been perfect.

Speaking of which, if the gameplay videos I've seen are anything to go by, that's actually been fixed in the PS4 version. I did see a video where Sephiroth's meteor attack was doubled in speed though, but honestly that doesn't sound like a bad thing to me. It makes the battle sound more cruhrazay and fun.