This is not a knock on Solarwinds, but a cautionary warning to prevent all the usual "I upgraded and now 'x' doesn't work - SW sucks!!11" users. Cirrus v4 has a lot of great new features, however, if you are using SSH on your devices *and* you were previously affected by the 3.5 SSH bug where only partial configs were downloaded, then don't upgrade to v4. I mostly see this problem occur with Juniper routers and I've been working with SW to get to the bottom of it. Evaluate whether you really want the new features before upgrading, or wait until the next maintenance release or service pack!