Premium Lifetime subscriber here. Personally, I did not notice any interruption to the service, but then again, I don't sync constantly so if there were problems, they were resolved before I noticed.
How about paying up when you rely on a service? That way you may legitimately complain when it goes down?
But it's behind a paywall! You're required to enter your credit card information before you get to download the application. One of the problems I had with the previous version was the phone-home type license. Now I have to hand over my credit info to some random financial 'authority' to test something that is supposedly free? VERY disappointing.