I have heard good things about RMC, but I can't specifically comment. The quality of a particular institution isn't the issue for a Masters, but the quality of the program(s) you're interested in at that institution. One program could be stellar and another just so-so.
Your profile is pretty thin, so I'm not sure what specific area you'd be interested in. I'm pursuing a Masters through Distance Ed for a couple of reasons, mainly due to the likelihood that I'll be posted before I get a chance to finish. I could have started something at U of O (which had a program I was interested in) but then what happens when/if I get posted? The U of O program doesn't have any DL, and they couldn't offer me any information on what other universities might have compatible programs for transferring credits.
The program I eventually chose is well-recognized in my occupation as a good one. There are 4 of us currently enrolled, I think, and I'm in a very small occupation, so 4 is a lot! It's from an American university, and there are many American military officers in the program as well, and now a member of the NZ Air Force. Although it's not a military program specifically.
Advice - once you figure out what program you're interested in, talk to people who have taken it and get their opinion. Graduates of a program are the best source of information, IMO. Don't discount DL as an option. Many universities have excellent DL programs. I can definitely state that I have learned a lot through the courses I've been doing by DL, and they are certainly not easier than F2F learning. A good prof (live or on the computer) will be guiding you through comments and assigned readings to synthesize and analyze the information you're taking in, not feeding you what you should be thinking, so whether he/she is standing in front of you or on the other end of a network connection doesn't matter as much as people think. It's more about what you are putting into it than what the prof is saying (at the post-grad level).