Andy, most PDAs ive ever seen done have moving parts either

I see your point though mate! Im sure its a bit quicker, but dont forget PDA specs vary wildly in clock speed, RAM, even down to the memory sticks the maps are stored on! So some PDAs may be just as good, whereas others may be laggy.

I use PDA one as i have a pda and its handy for a billion other things too

If its a fixed satnav system you want, then GO is the answer, for the rest of us....