be aware that Cubase 9 is the 1st Cubase to only support 64bit plugins and 32bit plugins no longer work in Cubase 9. it's putting a lot of people off because of legacy plugins or just older still working plugins that no longer will be supported or work in Cubase 9.
that's a big deal. not all of my plugins are 64 bit - about 90% are but there are a few that I still love and hold onto that I will not be able to use in Cubase 9.
just be aware and look into it if your planning to upgrade to Cubase 9. you may have to do some homework and workarounds to keep DAWing.