so after a test run, i shall give my opinion
the widget works great, rds tags are showing good. i'm using fmboost for amplifying the signal, without it the rds sometimes show and sometimes not(due signal strength).
The fmOn button is kinda small so a few taps are needed to hit it right.
Small to do list(if possible)

Make the FmOn/FmOff button bigger to hit.
Let the icon of the FmOn/FmOff button change depending on tx status
If the sms/music/phone tags are on, let the white icon dissapear and vice versa.
Perhaps implementing Fmboost would be cool?

if these points are due of my crappy UI design lemme know how i can change them to get the right result!

overall a great widget! needs to get in the repo's fast =D