hora – her indoors has got a Ford Ka and I reckon it's suprisingly capable on motorway journies.
Only issues are you have to plan WELL ahead as it's pretty slow to accelerate at motorway speeds & there isn't a great deal of soundproofing.
Aside from that – it's fine. It actually rides really well & doesn't get blown about like you expect it might. I always have fun driving it.
Oh, actually there is another thing that probably afflicts other small cars like the Ka – there's no clutch rest for your left foot. Not really an issue for me as I have quite small feet, but it might be if have mahoosive feet!