$50 for a todo app? Really?
Imagine a world where you had to pay 50$ for every app on your phone (I personally have 10-15 that I use regularly), every web app that you use (these guys have bills to pay too) and everything installed on your desktop computer. You wouldn't be able to use as much as you use today.
The fact is, this app seems great, I might try it, but I usually shell out 50$ for software on either an exceptional game that I know I will be playing for a long time (often multiplayer) or some development tool/license (for example Apple dev program). Organizing my life into items that I can tick doesn't seem that complicated or essential to me that it's worth 50$.
It's time to realize that software is worth something. The flood of the 99 cent apps in the App stores have really ruined software development for people who can't price their apps higher because they wont sell and they can't make money off of the way they price them now. I bought Things almost 5 years ago and I've never once regretted paying as much as I did. I tried to switch away from it for a while but kept coming back.
Todo lists just don't happen to be something I value enough to shell 50$ for. I might look into the iOS version though, I like portable todo lists a lot more.
It's certainly a bargain compared to a $10/month service like Flow.