Anyone using one?
yes, a wacom pen and tablet anyway, a few years old now
I am starting to find my mouse inaccurate for selecting out specific areas etc when I am PPing in lightroom. Are they eay to use?
I think so
Does it take up a lot of desk space?
None for me - I have my laptop on my lap so keep the tablet on a low table beside me. You can get different sizes, I have one of the smallest ones - pad itself is A5 but whole thing is bigger than A4 as there are lots of bits on it I never use as am used to keyboard. For the work I do I find this perfectly adequate and it does not involve too much wrist moving around. I used to have a smaller one that was even better, could reach whole thing without moving arm
How is it with LR4?
Not a clue but perfect for CS5, LR3 and everything else, I never use a mouse