Just got back from abenteuer allrad in Germany and saw the KCT and Outbound kit first hand. The KCT stuff is luxury yacht standard, but to be honest I actually preferred the construction and look of the Outbound kit. The frameless double glazed window and slimmer profile frame looked so much tidier than the bulky KCT stuff. The seitz s4 windows are so cheap and plasticcy in comparison, but I can't fault anyone choosing them (as I likely will!) given the cost of the alternatives.