We had Crossclimates on one of our cars (Saab 9-3 Aero Wagon) in 17" and they were fantastic. They are very clever, not only on the tread design but also on the silica compound. They generate more grip in most conditions that we have in the UK, especially in Scotland, most of the time. They aren't a gimmick. They developed these on the back of the work they did engineering a treadless (!) wet/intermediate tyre for Le Mans and endurance racing which is a dominating tyre!