I can recommend Xtar as well, i have a 4 bay for home and picked up a two bay for travel.
I checked IMR, and they don't carry the xtra's i have, mine are a couple years old so makes sense they have updated them.
I had to replace my prevous xtar 4 bay only because when i traveled, liquid got on it and one bay would act weird and i didn't want to take risks.
Seem like great chargers, variety of prices depending on what you want. I will say charges with screens that show what the current voltage is when you put the batter in and how it moves along are nice, more just to see how much of the battery you used if checking on things.