The "Browser Choice" is installed as an update, (which, if you don't have auto updates you can decline)...
All it does is force you to realise that there are other browsers, and point out what some of them are.
The only "hiccup" I've come across, on someone else's PC, was that, (On the 64 bit version), it puts the 64 bit version of internet explorer on the taskbar, even if you'd put the 32 version there...
This might casue a bit of an issue with some sites as "Flash" doesn't run properly in the 64 bit version.
Other than that I've not encountered any problems myself, not heard of any.