- Autofocus, really that bad?
- battery life, reports are its pretty low.
- can you turn the screen off? i'd rather have the screen off and just point guess and click.
- how good is it in low light conditions?
- what about capturing moving objects? ( most reviews i've read say its great for stationary objects, but capturing moving people is a bit difficult )
What are your thoughts?
Autofocus - depends what you mean by "bad". After the firmware fix it focuses quickly and, most of the time, accurately. If you mostly photograph big things - i.e. anything bigger than the rather large focus points - that aren't moving, it's fine. If you need precise focus, especially selecting among small things, you need to magnify, which slows the process down quite a bit and isn't always accurate anyway. It's a slower process than your Rebel, which I would rather use any day as far as ergonomics are concerned. Plus, there's quite a delay between taking shots. Whether any of this matters to you I can't say, of course. You may find that the size of the camera makes up for it.
Battery life - shorter than your Rebel, certainly
Screen off - sorry, but "point, guess and click" when you can't even see where you're focusing sounds absurd to me, especially since accurate focus is as important as anything else in taking a photo. But if you don't care how any particular photo turns out and like the element of surprise, go for it. (Actually, I'm not sure if you can use it that way - have never tried.)
low light - the image quality is at least as good as your Rebel (I suspect better, but I sold my Rebel before buying an M so I've not done any direct comparisons). In my experience it has exactly the same focus performance as in daylight. Overall, I suspect you won't find anything nearly as good for use in low light in a camera at or near this size/price.
moving objects - haven't a clue; haven't tried using mine for that.