As far as I know the only issue is that you need to keep getting the code from the original telegram client because they won't validate your account the via phone or email.
Once you start using tags on the app shortcuts & the widget mode with a history menu hidden until you press an invisible favorites bar it's impossible to switch to anything else it's perfect
You can try this out by metering your usage with Rethink. It measures how much each app uses on and off of wifi in addition to its myriad other functions.