I'm amazed at how smooth the app is and that it's ran by such a small and efficient team. I think this is a really big idea, and for someone like me it means I never have to commit to expensive office space.
I can hop on a train in NYC and know I have 30+ places I can go work, depending on who I'm meeting. And it's not a coffee shop or booth.
Sometimes a location is very popular and you might need to get in early (but most of them will squeeze in another Croissant user).