I've got one that I use as a spotter and will echo bewsher500's comments. Onboard screen is rubbish, but if you're on foot you'll have to live with it. I use a bike handlebar camera mount on mine to add either an IR torch or laser.
Distance-wise, I've seen rabbit eyeshine at the foot of a gate in the distance (lots of moonlight to help too), and then next day gone back to measure the distance at just under 400 yards. I couldn't confirm the quarry at that distance, and wouldn't have taken the shot, but it was a rabbit.