I have a pair of the CTM112's, which seem a very close cousin of the RM cabs, if not identical. I use mine with a 30w valve Little Bastard, so not had chance to really run them at a high wattage. Always used electric bass too, no acoustic sorry.
I really like them. They're very lightweight which was a big plus for me. Small form means they fit into a car boot easily and don't take up a ton of space when not being used.
I don't use tweeters so I can't comment on the quality of those. My experience is limited with only using the 30w but I'd quite like to get a smaller, higher-wattage head and put them through their paces. Running the Little Bastard as full bore, the cabs didn't seem to be struggling at all.
Hope this is some help