Go for it!
It is the things that we don't do in life which we regret, and if you don't do it you will always wish you had.
I have had mine two and a half years, and it has cost me nothing other than an indicator lamp bulb, and a brake lamp bulb: Less than 10 quid, and the smile has never left my face the whole time I have had it!
OK, so MPG will probably be in the lower 20s, but depreciation is minimal. People pay so much attention to Mpg and very little to depreciation, even though depreciation is usually much greater than the cost of the petrol.
The only down side is that it is basically a two seater, the back seats being suitable for very little. If you can live with that, go for it.
If you do decide to go for it, let us know, and you will get lots of advice: They are pretty bulletproof, but there are things to look out for.