I've been testing the Android app on my Samsung i9100 Galaxy S2 running Ice Cream Sandwich 4.0.3 (not rooted). I've been using it with a pair of Jabra Sport bluetooth headphones to get audio directions. I've compared this with Google and Synergic GPS for fairness.
Firstly I'll it's a great app. It is the only thing that I find find that is dedicated turn by turn directions for cyclists. I'd like to help you make it better so..
> When you plan a journey you can go back to change it from say 'fastest' to 'balanced'.. you have to enter addresses over again.
> About 10% of the instructions are wrong. I can't accept a single instruction being wrong as it has taken me into private property. Didn't have any problems with Sygic & Google.
> Audio directions via bluetooth cut out the first second or so for about 30% of the time. Google and Sygic work much better (90%) so it is not a hardware issue.
> Some of the roads / paths are read out as 'short unnamed link'. If you don't have the name you shouldn't read it out I think.
> When you deviate from the path it has set it doesn't re-route well at all. It will assume you are on you original route I would say up to a half a mile. Google and Sygic handle this fine.
> You cannot route with the phone locked / application running in the background. I have to disable screen locking which will drain the battery.