H2n is great! - Just a quick post to say that it only has four microphones in. Two arranged in MS format the other in XT format. You can set the H2n to either record the pairs down to stereo as a single file or you can have files for both the front facing and rear facing microphones. The latter would allow you to mix to taste in your DAW of choice.
Interestingly though, I seem to get more headroom in the latter setting on the dial rather that the 'mix down to stereo' settings, meaning that in a loud situation I have to go with separate files. In a small rehearsal room with the amps cranked, you will peak the inputs even with the gain all the way down on the stereo setting.
That said, the H2n is a little blinder and I find it fairly useful. - Especially, as in a video I recorded ages ago (long since gone now) I demonstrated using the H2n's live microphone output feed as an IEM or 'active hearing protection'. Very cool.
H4n Pro looks amazing as it has a much higher SPL capacity, which I believe is up to 140dB? Not that I will need THAT much, but I could do with a little more on the H2n. Tough choice: small compact and awesome little dude that has it's limits or it's big brother with lots of additional functionality, but is much larger for the gig bag.