Nothing.
In the past 5 years, I've been through (all new) a Honda 750 Shadow ACE, Honda VTX1800C, and a Suzuki Katana 750, in that order. Shortly after trading in my Shadow for the VTX, I started missing it for its weight, balance, and comfort. The VTX was obviously a torque monster, capable of 0-60 in "oh my, where did my clothes just go", but it is very heavy and likes to go in a straight line, not do a lot of turning. Traded that in for the Katana, which was very smooth and powerful, but couldn't get into a good riding position.
So, we arrive at the C50T. I've had it for about three weeks now, and I can already tell it's above and beyond the past three bikes. I immediately put a Mustang Seat on it - my only complaint being the stocker (flat). Shaft drive, screen, bags, fuel injection, liquid cooling, and more than adequate power. And, for once a manufacturer put a decent set of stock pipes on a production motorcycle. I think I'm in love with a motorcycle.
Take it from me - it's worth the small amount of money you have to pay for it. Sure, the C50T is no VTX1800, but that's why I bought it. Very comfortable cruising with a good sound and good power. Excellent handling!
Great review! Myself, I am trading my 2002 Kawasaki Mean Streak for an '05 c50 (before the Kawai, I had a Honda Rebel... WAY too big of a jump!). The C50 runs soooo smooth, the floorboards are so very nice over pegs! Like you, I do not need a torque monster, nor do I need to go at 140 mph, nor do I need a 750lb monster to have to lift in the event the bike falls over. The C50 will be a bike I have for a looooong time!
I just purchased the C50T and love it so far. I am new to riding and this bike is easy to control and has plenty of power for me. I got the pearl white with ghost flames and all the nice add ons Suzuki puts in their stock C50T. I will own this bike for a long time.