I just got a set of Zambus casters underneath my MM16 about an hour ago, and man are they sweet. After ditching the factory Johnson Bar setup, I went with a Delta mobile base for about a year (see this thread http://www.sawmillcreek.org/showthread.php?t=10507 ). It worked way better than the Johnson bar from a stability standpoint but I still didnt think it rolled on my somewhat uneven shop floor very smoothly. It would occasionally hang up in spots. Between posts here and on the MM Users Group forum, I'd been reading a lot of glowing posts on the Zambus casters and decided to go fer it. They showed up a couple of days ago and got them installed today. The hardest part by far was getting the saw off the Delta base. Got some help from a neighbor to get the MM16 up on blocks and slid off the Delta. After that it was a one man show. Removing the blocks was easy after turning the caster adjusters all the way up. In addition to the smaller footprint (no surrounding mobile base) it also raised the table higher, which is nice. Haven't measured to find out how much higher - it's probably only a couple inches higher but it feels like a lot more. With the footpads lowered, the saw aint going nowhere. It's as solid as a rock. But rolling the saw is incredibly smooth, even on my floor. Turns on a dime too, as all 4 wheels pivot rather than just the single pivot that the Johnson Bar or Delta base had.
No pics yet to prove this happened though. It's windy here today and the saw just kept rolling out of the viewfinder every time a gust came into the shop.