We down sized from a 5th wheel and purchased a 27DBUD late last fall. Just waiting for the cold and rainy Illinois weather to change so we can try it out. We wanted something under 30ft that would give us some space for those rainy camping days. Our 5th wheel was huge and open with sky lights and large windows, the 27DBUD is smaller but still feels open and large enough. We looked at several similar floor plans and kept coming back to the 27DBUD or the 26TBUD. To us they had the best overall finishes and options.
And no there is no water filter, we went thru ours to winterize it and we couldn't find one.