Well they're a bit extra aren't they??!! Question is which do you go for in your situation - the sycophantic Messerschmart or the confrontational Smartfire?
"Don't mention the war!"
Anyway, never heard of the company but that don't mean jack as they say. The difficulty with the Smart is the service history is held in the ECU and at the dealer - they don't (or didn't) have a book so it's tough to check.
That said, ours (as I said) was main dealer serviced all its life and still died a horrible death so all it meant was I'd paid Merc Benz £75.00 an hour for lots of hours I could have done myself.
The thing to do is ask them some carefully chosen questions and drop bits into the conversation. You'll soon tell if they actually know anything or not. The short version is you're looking for smoke on start up, drive away and between gears. Let them light it up and give it a blip - if it's blue and smelly, walk away. Similarly have a look around the engine bay - if it's covered with oil spray or squeaky clean - warning!
Do have a read on Evilution though because there are a few things which MUST be avoided. There's a cracking issue with the turbo manifold as as the man says "if you see oil in here, mortgage your house". Be sure to check the a/c too because the condensers rot and if the compressor fails, it's engine out!
Generally speaking they're not a difficult car to live with though you would certainly benefit from a remap - not for screaming performance but for sheer driveability. According to my mate the racing driver, our remapped 600 drove considerably better than his stock 700. To me, it just drive like a 2 litre anything - it was an absolute pleasure and really muscular between 3 & 4 grand.
Chequered Flag tipped me off about the oil change interval and it makes sense in hindsight. You've got 3 litres of oil expected to last 12 months or 12,000 miles. That's a lot of s....e to carry around for that time. The change isn't difficult if you've got a vac pump but plug sumps are plentiful too.
They're a tasty little sod when they're right and with the remap, you'll piss off a lot of bigger motors - especially those who can't figure out front from back with their baseball caps - plus you'll return something like 54mpg average. The remap also removes the top speed restriction and lets you drive it right off the dial but you'll need big b...s to do that with those skinny front tyres. DON'T be tempted to modify those btw - they're there to induce understeer which stops you turing it over - it's deliberate.
The other thing I've just remembered - and you need to be really sure you can live with this - is the throttle and gearbox are electronic. Now I know this will light your lemon and you'll probably buy one now just to re-write the software and cure it but it seems to me that the standard processor can't cope with the inputs it gets. I'll expand;
When you come to an island/junction and lift off, the throttle drops right off, if you touch the brakes, that seems to add to the situation and what then happens is if you see your chance to go and hit the gas, there's nothing there - at all!! You are quite literally hung out to dry for what seem like an eternity while the CPU updates and then suddenly - BANG! - it opens the throttle and you're away (just in time to change your pants!). After a while you learn to adapt you're driving style and do it either in a totally foreign way (to any other car) or you left-foot brake it and get on the power much earlier than you otherwise would.
It's dangerous, it's recognised as such and they haven't improved it a jot! Now that's right up your alley, isn't it??
I hope in doing this I've given you both sides of the car. They're a bundle of fun for a long time and if you really wanted to be mean, bung a gas tank in the back and run it for peanuts!
Cheers,
Jon
and has to be reliable 
