I had a Brompton in Boston. It makes absolutely everyone happy. It's been a conversation starter with everyone from 15 year old kids dressed to give a don't start anything vibe to 75 year old retirees.
As TFA notes, they're allowed on trains even during rush hour when full-size bikes are not. They fold effortlessly; folding and unfolding a couple times a day at the station is no hassle at all. They ride much like a full size bike, with the exception of the fact that if you pedal through a turn, you're much more likely to strike a pedal into the ground.
The only downside is that the 16" tires are murder on bumpy roads, of which Boston has many.
The 16" tires killed all the joy I normally get from riding a bike tbh. I tried better seats, shock absorber posts, different gear ratios, everything. Just sucked the joy out of the ride for me. Hiding "throw away" bikes around the city and far off bus stops etc ended up being my solution and it worked better for me at least.
My other option was leaving my all-weather beater bike down at the station near work. I ended up not doing that just because I didn't want to have to haul it back and forth a couple times a year for maintenance. But yeah, valid solution for sure.
I went with the simplest possible design for mine: fixed gear, v breaks sealed bearing wheels. Was basically zero maintenance as I only ever used the brakes for emergencies and used foot power for planned stopping etc. had gater tires, worked fine in the snow in Boston round all year.
I've always wondered about that. It sacrifices much for portability. Seems great for a certain kind of commute or short trips, but I'm not sure I'd want to tackle seattle hills on it. That said, I've certainly seen a few around.
Admittedly, I’ve never ridden a 16” wheeled bike. My 20” is rough enough that I’ve never bothered considering the smaller wheeled models. Maybe if I bike/train commuted every day rather than a few times a month.
As TFA notes, they're allowed on trains even during rush hour when full-size bikes are not. They fold effortlessly; folding and unfolding a couple times a day at the station is no hassle at all. They ride much like a full size bike, with the exception of the fact that if you pedal through a turn, you're much more likely to strike a pedal into the ground.
The only downside is that the 16" tires are murder on bumpy roads, of which Boston has many.