I've found the brake feel on my M90 to be spongy at best. I purchased the bike with very, very low miles and it's been this way for the past 14,000 miles that I've put on it. I've been considering some kind of upgrade, whether it be stainless lines or an M109 brake swap?
'09 M90 - Current Status: waking the dead.
After some investigation both front calipers leak. I have ordered new seals.