I've been commuting on a Whyte Kings Cross for the last year, and a bit of off road and cyclo cross races. Commute is 15 miles each way, 3 times/week average.
I've replaced the tyres (wore out), BB (developed play), gear cable, brake pads, chain, cassette and chainrings (wore out - didn't clean at all).
I can't really complain for basically no maintenance or cleaning. The Sora group is remarkably adept at still working despite increasing muck and grunge. Wheels have stayed true as well.
Overall I've been very happy with it. One thing I've liked especially is the lack of toe overlap - it makes track stands and filtering through traffic much easier.