Had a test ride on an 821 today - surprising how smoother and quicker it felt than my 821 monster. Just waiting on some final figures from them on Monday for a 939SP and some bling.....
Have you ridden the 939? Makes the 821 feel weak. I had both at same time so experienced back to back riding and the 939 just feels like it has a load more midrange. I think you'll be very happy with it.
My wife has an 821 Hyperstrada and I have a 939 SP. Correct on midrange improvement that can be clearly felt.
Admittedly im not on stock gearing....the lad who owned it before me changed the front sprocket as he said it went everywhere on one wheel plus ive not been back to see Chris at CJS since the K&N's have been fitted....something i need to do...