I bought the latest MDC from Smartmadness about a month ago. It was about $389 plus frt. It took about 1 hr and 45 min to install, EZ, no tinkering with wires like the 451 - it was a plug and play. It has a standard LCD in the control and an optional dash mount. It works in manual and autoshift. It has an adjustment that lets you readjust your throttle pedal sensitivity. It includes a complete new stalk and works flawlessly so far. It has been used in Europe about 10 years so it has tens of thousands of customers and isn't less than a year old.
Now in spite of the fact that I think MDC is better and there are others that say 451 is better I have to say that smart will not cover any failures that they think are the fault of an aftermarket CC. So far there is one reported expensive ECU failure using the 451 that Steven says wasn't the CC, but smart has told the customer "tough".
If you are interested in the MDC, contact Boris at Smart Madness and he will email you a copy of the installation and operators guides.
The Smart Dealer in Indianapolis said they do not do cruise control and further don't recommend it. I want Cruise so which do I get and where do I get it installed. 2009 located in Noblesville