I think that's a bad comparative Webman. Surely the whole point of RM is to provide an "all-in-one, ready to use" solution with various custom RM tools/applications. RM pride themselves on providing an already tested solution and service which is typically supposed to make it easier for non technical people to manage a school network. If you buy an RM solution, they install/set it up for you as part of the deal.
I would have thought the best method of upgrading is to test it yourself first, work with any problems you have, and only once you are completely satisfied - carry out the upgrade.