I moved from a MK1 to MK3.
They are good cars but tbh id consider also pricing up something like a Toyota Corolla or Prius, the interiors are so much better than the jazz, and are equally if not even better reliability than the jazz.
The thing which annoys me about the MK3 is the very cheap plastic interior, especially the doors etc. and the head unit is complete garbage, I spent an extra £300 and got a joying unit. Easy to fit and completely change the driving experience, it's great being able to click the talk button on the steering wheel and just chat away to Gemini etc.
So far in mine I have driven 60,000 and had 6 new tyres, changed oil twice per year, new rear pads, new front discs and pads, new sparkplugs, new Aircon condenser and pump, and oil filters, cabin filters etc.
So not too bad maintenance costs in reality, I just can't help being slightly let down the way the interiors seem to be cheap.