I actually did this, I can confirm that the subscription cancellation (which will take effect after one year) is right on the screen acknowledgement you get after the $7.83. No muss, no fuss.
Those with heavy duty defense systems (a lot of the Wilders crew, with sandboxes inside virtual systems backed up with multiple images wrapped in an enigma multipled by a puzzle) will pass this by. And my normal defense system of Avira and Online Armor is generally strong. However since Mamutu is light, and fits in between Avira and OA as a behavior blocker I figgered I would give it a go, after a trial download and seeing that the interface is sensible. (Oh, yeah, I also loaded the light PrevX recently, and occasionally get into "scan" mode with things like Malwarebytes Anti-Malware and there are security aspects to programs like Win Patrol and Avira Task Manager). There may be some HIPS overlap with OA .. however I do not mind a bit of overlap protection, as long as the programs play nice, which they do, I understand.
The fact that the investment was about two Starbucks things helped also. Potentially, seems to be a good fit on my system.