This app is *wonderful*
I have tried just about every window management/window snap tool available, and this is one of the very best. Not only that, it is also one of the cheapest!
Previously I used Flexiglass, which costs $10 and does far less than BetterSnapTool (BST). I have also tried Spectacle, which is free, and that is a good tool - but BST just does a lot more.
The basic window snapping functionality works perfectly, with a great range of configurable shortcuts. I also really like the popup menu that can be put on a shortcut, meaning you can get access to all the window snapping options without assigning every one to a shortcut. The new Snap Area feature is also very clever and useful.
I particularly like the ability to override the window title buttons (red/yellow/green) - a feature I have seen only in BST and Flexiglass, and BST does it far better: with a long list of possible actions that can be assigned to either the right mouse button or middle mouse button, on any of the three buttons. So in total you have 6 different actions that can be assigned, which is very useful.
The only bad thing I found in BST is that it does not automatically remind the user to add it to Security & Privacy -> Accessibility. It really needs to do this, as otherwise it can be confusing as to why the app does nothing.
For $2 this app is an absolute no-brainer - it does far more than many apps that cost 5 times that price!