TL;DRL: Don't buy it. Too much is broken and nothing has been fixed.
The studio had a 2 year beta phase where they released the game, from what I assumed, was to fix all the issues they could find. On release, all the issues were still there. Not just that, new issues were introduced. For online matches, people pick the top boxer of every division and spam power punches. The studio, for some reason, decided to remove any stamina impact power punches had. Speaking of online matches, there's no servers, all matches are P2P. That means the connection quality is based on your opponent, with the person with a terrible connection getting the upperhand because it's compensating for their terrible connection. Then there's the cheating problem. There's a lot of cheaters. They claim to use an "anti-cheat" but it sounds more likely that it's an "anti-piracy" software.
Then there's offline. Career mode is fine when it's lower difficulty. But once you go into the higher difficulties, they literally broke the game. My opponents hold their block up with no negative effects. They can dodge, weave, and run without penalty and will avoid any punch with lightning fast reflexes. Then there's the accuracy issue. I pumped a large amount of points in my fighters accuracy and they miss half of the punches thrown. The CPU opponent, however, has almost pinpoint accuracy on all their punches. My opponent can literally be standing still and my punches will whiff.
Overall, the only good things about this game is the detail on the fighters, the music, and it's the only boxing game in over a decade. That's it.