If drums needs correction, first group the drums, than analyze them, and after it is done, start working with sections like 4-16bars.
Never gave me phase problems, some misdetection, but no software is 100% accurate.
I adjust ea parameters on channels (snare, hats, oh's, etc) until it's fine sounding. When ready with the correction, use x-form.
I have tried it on acoustic stuff, and till you work with reasonably small changes, it'll work. But it won't work as a magic tool, adjusting huge things.
Tamas Dragon