My thoughts: it depends. No to any of the SV or SR models. Not to excited about the Series 3 as they have more emission crap on them. 400 series is alright, although the 410/420 engine had head gasket problems early on. I would rather have the 3.9 in the XT than the 4.5 in the 400. XT series seems good. 1845C was a winner. 1840 was good. Not sure on the 1838. Pass on the 1835C, engines were borderline junk. 1835B was good, 1835 would be about the same machine with no instrument panel. Don’t know about the smaller stuff.