my friend has one on his 05 STi.
its got LOTS of features, just about everything you'd want out of a remote system. hasnt had any problems so far, has had the system in for over a year now.
but a couple months ago, i talked to a guy that has one of those alarm/audio install shops and he said he doesnt sell the RSX3.5 because he's had problems with a few units. something about it not programming right, or not retaining the programming. not sure of the details, you might want to ask around and see if anyone has had similar problems.
my friend on the other hand hasn't had a problem since he got it installed.
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