I've had mine undersealed against rust.
Watch out for wear on the hood, especially early models, as they are easier to replace the entire mechanism from a scrappy than replace the fabric.
They all leak. They're designed to leak. But the drains can block and flood the buckets/boot.
Facelift model has some fixes in to make it less likely to spin off and kill you, and to stop the engine lunching the piston rings, degrading the pre-cats, re-ingesting them, ovalling out the bores, and eventually running dry on oil, seizing, and throwing a piston through the block. Happened to my neighbour
Mine runs on fresh air. Driven with lots of enthusiasm, I get 250+ miles off a £45 fillup.
Tax is £210 a year. My insurance is around £400 with business use.
Tyres last a few years (unless you're Dan Webster). Servicing costs me £100 per year. It doesn't use any oil. Full set of disks and pads cost me £150 fitted. New clutch was under £200 fitted, IIRC.
The only reasons I'd swap mine are that it doesn't work on my steep icy road in winter, and because it only has 2 seats and minimal boot.
My dog falls off the leather seats, and the boot isn't big enough for my massive rucksack.
Oh, and it feels very vulnerable on the motorway. And will kill you if you drive like a fanny on greasy surfaces.