I have found the GPS fixing is a little slower than a Qualcomm S3 device (but not much). There's no Glonass support that I can see.
The phone does have dual band WiFi and I get excellent reception at home. I will do a comparison later though, although my Xperia S only does 2.4GHz (I should have an Xperia T soon that has both).
I'll try and check some other devices too. Just bear in mind, the RAZR i isn't claiming to be the fastest device on sale. It's about the whole package, which I think it gets just right.
Low light photos are also quite grainy, but have less colour noise than my Xperia S. Swings and roundabouts I guess.
back home now, and on the way - I tried out the GPS and it got a fix on 3 seconds! This was on a train, which - as you can see - was doing 95mph! So, actually I take back what I said - it seems to work exceptionally well and perhaps I was just unlucky before.
I'll do a Wi-Fi comparison another time, as I need to boot up a number of phones. However, I'm getting around -60dBm to -50dBm from where I am sitting using Wi-Fi Analyzer, and my iMac which is connected to the same router in the bedroom (about 10 metres away, but through two walls which is a bathroom) has 46% on the 'Network Strength' app - not sure what that translates to, but it's presumably around -70dBM or worse . Both are connected using 5GHz. As you might expect, it's slightly higher with 2.4GHz - but slower on the network.
When I put the phone flat on the desk, it drops to -65dBm but is still good enough.
Meanwhile, here's a screen grab of the Wi-Fi service on the London Underground. Check the UPLOAD speed!