I kind of half forgot about it until I got on the bike this afternoon. I took a 50km ride and boy did it feel different! Like a whole new machine. Countersteering is much easier, and it feels like my shoulders are much more relaxed. I'm really shocked at how different it feels - and I really like it.
Not that it didn't feel good before - it has always felt incredibly comfortable, the best bike I've ever ridden ... just now it even feels better! I never would have thought that such a little thing would make such a big difference.
If you haven't tried fiddling around with your Thunderbird handlebars, I highly recommend it!