Have been using this for a week or so to clean up my feed, and I'm impressed. Initially I was worried that it wouldn't remember my session and which tweet I'd got to, but when I accidentally closed the app, it opened up right where I left off. Perfect!
The Revert feature is a good addition too, allowing you to cycle back through tweets you might have kept but have had second thoughts about. Some messages can seem innocuous but if they're part of a troublesome thread, it's easy enough to delete the lot.
Would love to be able to keep or delete my likes too.