i've done a few versions of my own car pc (3 to be precise!), and front ends i started with frodo to RR to centrafuse.

i must say, when i first used RR it was extremely alien, not very user friendly and seemed all over the place, this was a few years ago, so i think RR was relatively young in a development sense, but an intuitive GUI is always something that should be easy straight off the blocks, not something that takes ages to do or even have the need for someone to "skin" the program for you.

on a comparasion basis back then frodo was much easier to use then RR, the intial setup interface of RR was very poor in my eyes, but I haven't used RR for quite awhile now (possibly 1 year) since i've moved on to Centrafuse but it did its job "well enough"

since i've moved over to CF, i'll never look back, the thing works 99.9% exactly how you need it, support for issues so far has been excellent.

i find the problem with open source is you are always "waiting" for people to implement, and if the developer base is large then i think it makes the system too complicated, i found that with CF, once its installed it has the simplest initial setup and after that everything just works, no fiddling.

if RR was like that i would certainly look into it if CF decides to charge more money for extra features, etc and i think its not worth it.