I also bought a mk3 without trying it, the other half decided she wanted one, no point arguing... I'm 5'8" but had no problems with seating and comfort, with hindsight as I'm getting older I should also try before I buy, I usually test drive 2nd hand cars to see if I can find faults but haven't bothered with new cars as they're under warranty and you don't test the actual car you are getting. Also find dealers a faff to get involved with. A lesson learned I suppose.
Last new car I tested was a Nissan Note in 2006, eventually bought a 2 year old Jazz as it had more room for baby buggies etc. It was pricey at the time but I think I've just about had my money's worth out of it 13 years later.