There are some nice improvements in these newest versions, but there are important things to keep in mind. First, the good stuff: All plugins (except for M7Control) have a powerful new search feature that makes it easier than ever to find the presets you're looking for. You can learn how search works by watching this video. There are also new presets everywhere, including new M7 presets from Scott Millan and R2Surround presets from Tom Marks. There are lots of small improvements for stability and security. You can learn more from the download page.
There's also an important warning. Your old sessions will easily load into the new versions of the plugins, but the save format has changed. This means you won't be able to revert to older versions. If you're in the middle of a big project, perhaps this isn't the right time to test. And if you do decide to test, you might wish to start with copies of your projects.
Thanks for your help. If you run into issues, there's a test form available from the beta download area.