With miui, you have to use rom manager to get into clockwork. Holding power and choosing recovery (like other 2nd init roms), will only get you to stock recovery.
MIUI
this Rom is the best I've ever tried it may have some bugs but don't all betas?
OK im annoyed. I like this rom, but it keeps putting my phone in airplane mode and cutting my signal. I have to reboot to get it back (toggling airplane does nothing). I'm going back to cm. Sorry.
MIUI