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You can do a quick search on the 601 forum and find several threads. Here is a link to the latest: http://www.zenith.aero/group/ch601/forum/topics/vgs-on-601xlb
I have their VG's on my 2005 CH601HD. It was the best performance improvement for the buck. Simply peel & stick... no lost VG's in 10 yrs. Kits has lots of spares anyway. They are clear lexan... can't even see them. Victor Struzak did all kinds of testing on VG's. Because the CH601HD design has no flaps the VG's were used. Not sure about the CH601XL-B but I have flown several of them and can't see why it would not enhance the low airspeed handling. VG's work great on most aircraft.