I ran Viper for years, when Sunbelt was in charge. Even beta tested extensively. GFI "took over", and it seems to be sinking swiftly. Loved the program years ago. I personally own a lifetime license, but highly doubtful I'll ever use it. There are many better options out there. Sad what transpired with a good piece of software.
So no, in my opinion, it's not a good deal.