I was at the Tulsa Dealer 3 weeks ago. I asked about the 451 CC and service mgr said to wait till the 24K is up then do it (I have the additional 70K version)...
He said even if some dealers are installing 451 CC unit , that SMART is rejecting all claims related to electronics with the 451 CC installed...
He had delt with 3 issues so far , the owners have been $2/3K out of pocket for repairs.....
To me

, it really SUX'z

that we have to intigrate into electronics systems..... All other DBW's have a ONE switch that hooks into the ECU and presto , CRUISE CONTROL!!!!

The ECU has the capibility to do it all!