An update to this thread....I've had my No Mar Junior Pro now for a couple months and done four wheels and tires on it. This tool makes tire changes laughably easy - I can't hardly believe how much so. Tonight I did a front tire on my Guzzi in less than three minutes total time. It takes longer to get the front wheel off than demount the old tire and put the new one on.
RECOMMENDED. Close to a must-have tool for serious cyclists.