The Mast-R-Lift II adjusts from above, it's the Mast-R-Lift Excel II that adjusts from the side. The Rout-R-Lift II comes in 5 versions, based on motor diameters between 3.218" and 3.625", while the Mast-R-Lift uses movable clamps to take care of a wide variety of motors without having to use pads (or be forced to stay with the same diameter motor). The Mast-R-Lift is also more robust (in my opinion), though I don't think I would wear either one out. The MastR-Lift is available with either Jessem's twist lock rings (2 sizes included, additional available) or with Incra's Magna-Lock (5 sizes included--the clean-sweep rings also fit but are sold separately).
I long said that with my Bosch 1617's i'd never need a lift. That changed about a month ago when I stumbled into a Mast-R-Lift (Incra version). It does make set-ups/tweaking much easier--and is accurate enough to almost eliminate the need to even check the depth. there is no lash on locking or adjusting the height either, both of which were a bit of an annoyance while using my Bosch fixed base in the table. I did add the clean sweep rings, just about negates the need for dust collection at the fence.
I'd looked at both versions in person over the past few years, and would not have been upset owning either.