I've been using a Demi Prototype for nearly the past years 2 years, and have really dug it. It is not 110/220 If you travel overseas you will need a converter (i've used one with no problems).
It runs smooth as there other power supplies, and does have a transfer button for liner/shader.
It is small as hell, and with no bulky back end it's ideal for travel. although I will admit its almost too small for my big mitts.
There are some minor little quirks, all that are super easy to deal with.
I personally have only used an older Eikon power supply (it was a while ago, So I do not remember the model), While guesting at a friends, and had to switch to my Pulse because I did not like the way my machines ran on it.
It is all digital, so you do get to see how many volts your putting thru to your machine, but that really it.
Before that It was a Dave Long power supply, and a freedom 1. So IM sorry I do not have more examples of good or bad for you. Before my Demi, it was Pulse's other power supplies. I've had no complaints.