Ok, so I got the Powerlab. Holy cow, it's got so many options! Also got the Android CCS application for it. It syncs battery data to Dropbox, supports NFC from the phone (and the charger obviously!) The charger is fully controllable from the phone at all times.

Build quality is very good indeed. Whilst it won't discharge at 40 amps (unless connected to a lead acid battery) it will charge at up to 40A with the appropriate power supply. I got the single channel, but when I can charge at a pretty hight rate, it doesn't matter anyway.

Recommended as a quality alternative to an iCharger for sure.