Glad you like my software! A long time ago, I had some RSI issues that were alleviated by using the Magic Trackpad, and this led me to create the Multitouch app[0] to add a bit more functionality to the Magic Trackpad. From there I wanted to add in window management, and ended up rewriting Spectacle as Rectangle. I feel really lucky to have people enjoying the things I've built!

[0]https://multitouch.app