This is without doubt a phone which beats Nokia E and N series hands down (they also support the SIP client). I have great results using them with Green Kitten Technologies - it does not lock up or get excessively hot, it handles calls at the same time from WLAN and GSM and I just love it when I use the voip service from telenosis.co.uk NO MORE BILLS !!
Battery life is easily within stated parameters and overall feel and compact form factor make it a neat mobile and office phone all in one.
Setting up the entire features is easily done from the keypad even though there is a remote setup function. Additionally there is a Nokia style ease of use but BEST OF AF ALL - it is quick and responsive not sluggish like its competitors
A great handset and something for Nokia and Ericsson to worry about !!