I've recently installed Outfox to try it out. Had some trouble logging in but resolved it after receiving excellent tech support.
I've only tried Outfox in PUBG and Overwatch. In PUBG it works well, I'm getting around ~30% improvement.
In Overwatch I get around 60% improvement, however I'm facing a very buggy behavior. This is what happens every time I connect to a game:
I enter the hero selection screen
Outfox detects a session was started and connects me to a server - it is worth noting that at this point my ping already starts dropping in-game
I get disconnected and reconnected to the game - my ping goes up
Outfox detects the session was ended for some reason, then detects a new one
I get disconnected from the game again and thrown into a very long loading screen, and then back into the hero selection screen again, my ping goes down again
This sequence takes almost two minutes, which is crucial in a game like Overwatch, as that usually costs me talking and making strategies with my teammates before the game starts, as well the entire pre-match setup duration (which is usually 30 or 60 seconds). If I'm playing defense I'll still be at the spawn room when the match has already started.