I'm using the T5i, recording video, editing in Final Cut Pro 5, 6, & 7. While recording, when I'm approaching the 29:59 limit, I wait for a break in the action, stop the recording, then immediately start it again. So far I've been successful in splicing the files together using a transition to smooth out what looks like a jump cut. It sure doesn't work with any action shots with rapid movements but I can usually find some B roll to cover the jump cut.
HTH.