Power usage depends on many factors - actual situation with cell signal strength (GSM) in different part of day, types of Wifi routers (and signal powers) You're connected to, etc, etc...

The main thing of concern is powertop output and raw power usage monitoring. If both are OK, there is nothing to worry about.

Other than that, I can't help - it's Your device, so You have best chances to observe it and report oddities. No other things I can suggest without actually having device in hand.

/Estel