The 24P is 24P. Not sure what would be off about it. The bitrate is higher on the HF11, but the motion is 24fps on the HF10, which is what I'm used to.
As far as downloading footage, if you don't download the folder with the footage you might run into some problems. It's a lot like P2 in that way. I've had no luck downloading individual mts clips but everything worked fine when I downloaded the whole folder intact...