While I remember, I suppose I ought to post my thoughts on the 6915
I got mine to replace the Orange SPV C600 that I've got; they're both WM5 units, and having used an old iPaq h1940 in the past, I'm well used to HP gear
orange were a bit of a pain in this respect - I was originally hoping to upgrade to an SPV C1300, but they tried to stick on a massive (£300) upgrade fee, even though I was willing to outright buy the new handset -0 so much so that I wound up telling 'em where to stick it, and got a better unit (the 6915) SIM-free through PC Word Business instead (Got a nice discount too, lol, and that's between me, my accountant, and PCWB :twisted: )
Anyhow, I spec'd the 6915 due to the AGPS and iPaq factor, the camera and keybard was a added bonus. I then got hold of TT6 Navigator - having used Navman before, and not being impressed with the lack of POI files, I went the TT route this time - and mightily impressed I am - processor speed on the iPaq is FAST, and lockup with the quickGPSfix addition is simply incredible

Add to this that it's a WM5 device, and I can run all my previous WM5 s/w from the C600 on the 6915, and I'm in hog heaven.
Aside from the problems regarding recharging on the go (noted above in the thread), things are good

And I'll be getting a powered car cradle to solve that problem shortly (I'm looking at the Arkon powered iPAQ Mount for my iPaq -
http://www.addonsworld.co.uk/product.php/27096/0/ or similar - this one's only one possible supplier, lol)
Roger