I've had my 600D for a couple of years now and, as an entry level DSLR, have found it to be a good performer capable of producing some quality images. Certainly had no mechanical related problems with it (although I did by a second battery for it as it only comes with one).
Can't comment on the kit lenses that come with it though, as I got the 600D body only, with a Tamron 18-270mm f3.5-6.3 zoom, which I have found to be a reasonable all-rounder lens (again, not top-of-the range, but certainly adequate for my needs to date).
And just last night I ordered an 11-16mm f2.8 Tokina lens, which will hopefully improve my so far mediocre nightscape efforts (hurry up Mr Postman!)