Panda 100hp is absolutely hilarious at pretty much any speed, most of them still well below the legal limit. It’s a cheap car so the interior is full of hard plastics, but that’s part of its character / charm. As someone mentioned above it can be a bit bouncy (ours is affectionately referred to as the spacehopper by my other half).
Despite its bouncy revvy nature it’s also surprisingly reasonable to drive distances on the motorway. The only downside is its relatively small fuel tank.
It’s more practical than the 500 due to its boxy shape and rear doors. Although it’s small you can get a surprising amount in the back with seats folded, and if you take them out altogether (a 5-minute job with a spanner) then it’s like a small van… However, there’s no getting away from the fact that it’s a small car.
I stuck winter tyres on mine last year which took the edge of the handling (it ended up feeling a bit ‘smeary’ when the roads started to warm up) but it did make it pretty much unflappable in poor conditions. Because the wheels are so small (15″) tyres etc are relatively cheap, so having a second set requires a bit less financial commitment.
I always feel that it’s also very innocuous – no-one’s ever going to feel ‘menaced’ by a Panda – and it (perhaps) has a bit less baggage than some other warm/hot hatches in terms of image.