Nothing. Still breaking it in.
This is my first cruiser after riding several sport bikes over the years. I have come to realize as I get older (and fatter) that comfort is more desirable than high speed cornering. I guess I have outgrown the need for speed (and tickets). I am 5'10" and about 250 lbs and this bike accelerates nicely even with my wife on back.
I decided on the bike because 1) I like the styling, 2) pricing for what you get is pretty good 3) decent gas mileage and 4) I wanted something lighter than the 1300cc and up gorilla's. Too bad they decided to change the style of the 2010 M50 to match the M109R.
Only nits with the bike so far are the brakes (why couldn't they have put a disk on the rear?) and it would be nice to have a sixth gear. Personally I like the quieter sound, but if you don't it an easy fix.
Overall, I love this bike and it is a pure pleasure to go riding whenever I get the chance.
I just looked up the 2010 M50 and you're right about the new styling. The M190R are ugly as hell, I don't know what those crazy people at Suzuki are thinking.
Anyway, I'm looking to get a mid-sized cruiser as a second bike after I get all I can out of my Virago 250. It's still somewhat of a toss-up between an M50, the Shadow Phantom or V-Star 950. But, it'll come down to price.