I would absolutely love to one day own an OP-1. Teenage Engineering does amazing work. All of their stuff has a certain tactility to it. They definitely put a lot of thought and love into their work.

For those that can't justify spending about $1k for one, their Pocket Operator series is pretty fantastic.

I also recently bought myself a Novation Circuit, which honestly has the feeling of Teenage Engineering's interface design (minus a lot of the whimsy). For about $300, it's a fantastic little groovebox that I'll be getting a LOT of mileage out of.

Edit: formatting.