This business of chipping is, I think, irrelevant. You can also buy the Brabus Smart which, in the UK, costs twice what the basic version costs.
I have driven both the basic Smart (deliberately chose for the test drive, even though I was offered various souped-up versions) and I must say I prefer the Yaris (speaking as a great Mercedes fan). The Smart is very spacious for the two people but has no other room except for a shopping bag, whereeas teh Yaris will fit more luggage and people, and did not feel badly made. Also the Ford of Europe Fiesta and Focus are better value for most people.
The Smart is definitely an urban car. It sells well in Paris and Rome and, probably, London, but that is not sufficient to make the car a commercial success. All product extension measures (Smartforfour, cabriolet etc) have failed to turn the fortunes of the car round. Its original idea was good, I suppose, but the reality turned out to be unfavourable. Let's not forget it was a Swatch idea, with DC being drawn in as the car-manufacturing partner.
DAS
For direct contact replace nospam with schmetterling