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the restrictions on 210fps are smallish resolution (480xSomething)
and no longer than 10 minutes recording time (which would be 70 minutes continuous playback time
)
it can also record regular 30fps as 720p HD or whatever its called (not full 1080p HD)
camera spec here
http://exilim.casio.com/products_exfs10.shtml
it takes SDHC memory cards, I have an 8GB in mine and at most so far, a days filming has taken up ~3GB, obviously if you go nuts you could fill it.
I would defo buy the camera again, it does good static photos, 30 shot a second burst photo and also the slowmo stuff, it even does 1000fps but that is at a very small resolution. the camera is also tiny!
downside - battery life isn't great, but you can get extra batts for a tenner.