CPU usage is my primary complaint with Meldaproduction stuff, too. That and the sometimes-obtuse UIs. But in terms of bang for the buck, Melda's pretty hard to beat.
The free upgrades for life policy means a lot to me, since I bought the Meldaproduction stuff back when I was much more affluent than I am today! I was once a Voxengo fan, but stopped upgrading when it got too expensive to keep up.
Now the bad news, at least for me. I installed the version 8 update for MDynamicEQ and it's totally whacked. The plugin takes forever to initialize, comes up with a partial display and is then unresponsive. SONAR then hung when I tried to close the project (a nearly-empty test project).
Note that the version 8 install requires you to uninstall your existing Ver. 7 plugins and re-scan your VSTs. Theoretically, this should not impact existing projects because the new version uses the same CLSID and therefore looks like the same plugin to SONAR. Existing settings and automation should be preserved, and you do not have to re-authorize. These points I was able to verify.
Unfortunately, the update has broken every project that I've ever used this plugin in. Hopefully, uninstalling and reinstalling version 7 will fix me up. I'll do a little more experimentation first, though.