The rotary switch is smoother without detents on the U2 in my opinion. As always, I wish the UM2 had a higher high and a lower low. As much as I like having the six power settings, I can see the future with the EDCL2-T which is much brighter on high and has a low that seems to be about step 2 on the UM2. The EDCL2-T is a smaller, brighter light with a lower MSRP that in most cases can do what the UM2 does with a similar TIR beam.
Now, if a UM3 could be made with the EDCL2-T form factor and a selector ring, I'd sure buy it. :thumbsup: