Welcome to the club!
I bought mine for £4,300 last August from a local dealer (non-MB). 52,000 miles, more-or-less full service history, 2 lady owners. It ran fine on a test run, had a lot of fun pushing the revs. I knew nothing of the car at the time, other than that it was incredibly rare. In fact I tried to sell it, as I couldn't justify the cost of the fuel over my 40mpg micra... glad I didn't, as now I've got to know it much better.
It's now closing in on 59,000 miles, and has (touch wood) had nothing at all go wrong. New brake pads all round, a full B service (which is basically renewing everything) and that's it. Normal stuff.
Yes the wheels are a bit pants - they are probably the most beautiful wheels I've ever seen, but I've had a total of 4 flats due to knocking potholes, so replaced them with some nice Team Dynamics wheels.
The engine itself is beautiful. Best engine I've ever owned, except maybe my P11 Primera. It beats most anything that's had a go - many BMWs, Golf GTis, and I laughed off a Fiesta ST today.
The ride is also the best of any car I've had. It lacks the nippy, playful handling of the Micra, but it WILL NOT slide. I have tried, but I can't get the back to slip more than the tiniest amount, even at speed on wet corners down gravelly country roads. It's really no fun on bumpy roads though, due to the stiff springs and skinny tyres.
MPG... well that depends. I've had as low as 15mpg on a (fun) ride, but also as high as 45mpg on a long, easy motorway run. Average about 28mpg on a typical tank.
As for the rarity of the car - it gets a lot of looks, especially from the aforementioned BMW drivers who aren't used to being shown up by a Smart. I've kept mine largely a "sleeper" (thanks in part to a Badger stealing my rear splitter), so it shocks them harder
It's also nice pulling up outside work, and someone asking "what
is that?"
So yeah, my recommendation is do it. You've obviously already done some homework. You'll love the car - I think all us Brab owners on here do. It's something special in many ways.
As I said, I paid a dealer £4,300 about 8 months ago. Just about anything that
could be wrong with the one you want, you'll find the solution on this forum. Most things I've encountered have been very simple fixes. Some parts are expensive (usually the Brabus branded parts) but I've found most Smart branded parts to be quite reasonable in the scheme of things.
Yeah so that's my bit. I do sometimes write a lot
PS - shame - you just missed out on a lovely modded CDi in Plymouth. It's in Ireland now though