I have a iPaq 5550 and a 6340 both with TomTom5 and it works flawlessly.... never had a problem with either... The missus connects the 5550 to her mobile too, and it uses the gprs to show her traffic problems etc.... Great kit, and well worth the money!! There isnt a "pedestrian" mode as such, for rambling walks etc...... but it does have a compass on and shows you which way your walking, the TomTom5 bluetooth device even has a hole so you can attach it to something to go round your neck or something whilst your walking
Gem charges hers up on her way home after an entire 8 - 10 hour day... never has a problem with battery life... the only thing she doesnt like is the iPaq only lasts a few hours on batteries - this is the std. battery though - so she has to keep plugging that into the cigarette lighter.. but all the leads come with the mounting kit anyway
(the 6340 lasts me 2 days without a charge...)