Segways are amazing fun, but they're most enjoyable when your mate owns it, so when you're finished riding you realise you didn't just drop a few grand on a toy for half an hour of play, only for it to then sit in the garage for weeks or be forgotten.
The owner of the car dealership where my dad works bought a few of them a couple years back so the employees could use them to get around the lot faster, they were a blast. Brought the off road version home and took it around the forrest behind our house. Was quite dangerous though for a newbie, pretty easy to fall and do some damage if you're too adventurous, would definitely segway again though.