e-bay pricing was on a bid, not buy-it-now, but 4 went for about that price, all of them new and under guarantee.
GPS takes a little while to initialise (5min or so) but mine will do that on the move. I use Tom Tom (UK) and it's fine. The voice is very quiet, poor loudspeaker, but you can run a headset or blue tooth to earpiece. GPS and bluetooth soaks up the battery so I use an adapter (unfortunately not a standard fitting, but compatible, with an adapter, with USB output voltages.) Battery extenders & high capacity batteries are available.
I run older apps and so far had no issues (but no guarantees!)
I have only used a 2gb card. I understand that it will use higher capacities, but not the higher speed ones (but I could be wrong.)
Skype works well on it.