I have heard that A LOT of applications don't play nice with it. I only use Pandora for music, so I can't comment on the applications you listed.
Also, I read some articles on JIT that say, although our benchmarks will show improvement, it may actually SLOW the everyday use performance of the phone. Whenever I've used it, I've had lots of force close and reboot issues in general. My recommendation is to only use it on Froyo ROMs.
That's been my experience as well.
