As far as rear wheel swaps go, Kawasaki sucks (dirt and street: I have a KLX450r and a ZX6, had a ZX10r) Suzuki sucked (Gixxer 600) and KTM is a dream (often done in under 3 minutes). I fucking hate changing the back tire on my KLX, and with it was a KTM for only this reason. Other than that the KLX450r is awesome.
My Aprilia parts shipped to day, so I should have that bike on the road by spring. As a purpose built Sumo, it will be interesting to contrast the SVX550 with the KLX.