Very true Shelley, but the A-1 only has a 23" throat. The Gammill also has a nice track system, but the Optimum has a 30" throat and moving that machine around is easy. It's not only the weight of the machine, but the size is in play too. My Ultimate I only weighs 42 lbs. compared to the Optimum that weighs over 80 lbs. I don't know about you, but I rather push 42 lbs. around while doing stippling. Easier on the hand and arms, let alone the body. zeke...........