I took my 750 K6 to them yesterday because I wasn’t entirely happy with the job that Banjax did. Nick managed to get a few more ponies out of the scooter to give peak power of 133bhp and raised the torque slightly to 56ft/lbs. I wasn’t actually after more power though, I took it in because I was looking for smoother power delivery, and that’s exactly what I got! Bike is smooth as butter now, with the bike doing exactly what my right hand asks it to! 
I always use PDQ, Nick is a top bloke no bs and wont sell you something you don’t really need.
Glad you are happy with them fridayman.