Just pitching in with my support for Operator here. I am very lucky that I got it free when upgrading (sorry guys!), but for a while I was trying to give it away because I didn't use it!
Fortunately, I wasn't able to split the free Operator from my Live licence because over time I've come to cherish it. Love the way Ableton plug-ins intgrate in Live, and I love how economical Operator is on the CPU. Oh yeah, and it sounds great!
Am currently using lots of instances of it to create a 'sequencing rack' using Novation's Launchpad M4L step sequencer.
I do have a licence for Microtonic which I also think sounds great, but I've just stopped using it as I do everyhting in Live and M4L now. I'm tempted to upgrade to Suite, but having demo-d the other included synths I know I wouldn't use them as much as Operator.