Well, interestingly enough, I have baked 6 pi's for myself and friends and family, mostly making them into XBMC media centers, and I saw an MK808 mini pc stick for a descent price before christmas so grabbed one to compare...
Just arrived in the mail today, I'm at my office now but intially I must say it is snappy.
I downloaded and installed XBMC in less then 2 minutes and was streaming cheesy college humor in 3.
That is to say after 2 random crashes of Jelly Bean (android 4.1) right off the bat... one blue screen that made me reminisce of how bad windows 95 was.
2 more crashes with XBMC Beta RC2 since demo'ing it for the guys here who aren't up on the latest gadgets...so lets see that's 4 crashes in less then 15 minutes, no heavy use and I can't imagine its over heated as its dangling in the air off one of our 60 inch plasmas....I guess the jury is still out though, I'm done playing with it for now as I'm working, but maybe after initial configuration (haven't set locales yet or anything) and see if an update is available, maybe it will be more stable. If not, it's going back. I can understand a crash or two on XBMCs beta, but the OS it shipped with itself!? I'm almost tempted to send back now.
For what its worth, it is very snappy and the streams I did watch were of good quality and wireless. I'll be headed to Thailand for 3 weeks and wanted to incorporate it into my travel pi setup for back-hauling photos too my home NAS (ZFS on Linux FTW, dual core green processor, 6 TB of Green Disks in a Zpools zfs raid for
Definitely was worth the money for me to see if its feasible.