Anyone use Comfortis and have anything good or bad to say? What about others like Program, Revolution, Sentinel? Ideally I'm looking for something with tick control but I've never seen a tick on Renji and our main issues is fleas. I'm interested in Comfortis most as it's new and so far, seems to be okay. Is Program still functioning well? I know you can use it with Capstar to nail adults AND eggs.