Brompton electric here.
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Like speakers, I also review ebikes, and I've tested dozens of models. The Brompton electric is the only ebike I've felt like I could really happily live with in a city environment and I ultimately enjoyed it much more than all the bigger, more powerful ebikes I've tested. So I ended up buying my review unit. Absolutely love the thing, and I take it everywhere from the city to light trails. Bought an extra (very overpriced) battery for my 30+ mile rides too.
I'm a bulky 6'0 guy, but I actually appreciate the small wheels and the nimble ride for weaving through city congestion.
Here's the bike in a more recent form with the rack and a larger bag for groceries. You can see a Genelec cameo from when I was testing the 8341s =]
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When I need even more cargo capacity, I have a trusty burley travoy trailer:
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Of course, the main selling point is the tiny folded size and in NYC in particular it really makes a difference; it's the difference between places not batting an eye if I bring my bike indoors with me and me having to lock up other folding bikes outside. Its been particularly appreciated this year where I had to visit family in the in the hospital very often, as I've always been able to bring the bike indoors with me.
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As for the cycling vs car things, I'll just put in my two cents and say that city infrastructure in the US should do a lot more prioritize cyclists, and there are many reasons cyclists shouldn't be following
all the existing rules of the road (spoiler: they were made for cars). I'm personally a big believer in the
Idaho stop, though at least here in NYC it was legalized that cyclists could advance with leading pedestrian signals a few years ago, which is a passable compromise.
NYC and most cities would be a million times better with more cyclists and fewer cars, and I say this as someone who used to regularly drive a big old Chevy truck. Of course, not everyone can ride a bike or even an ebike, but certainly there are many people driving cars who don't need to.
Among people my age in new York though, the reason I hear most often for people not riding bikes is bike theft. People seem to assume their bike (or a wheel, or saddle, or anything the thief can get their hands on) will be stolen at some point, which is a shame. Another benefit of the Brompton.