28mile round trip? great opportunity to get fit.
beater off craigslist. learn to do your own maintenance.
i would suspect you'd regret buying and riding around on that puppy while you have a functioning body thats perfectly capable of riding 1 to 2 hours per day.
A problem with that observation is that not everyone really has the time to spend 2 hours a day riding - it's nice if you can do it, but a CA-spec pedal assist ebike cuts that down into just over an hour of commute, which isn't that much worse than car - and you can usually work it out so you sweat less on the way to work and can skip the shower.
Even things like being able to accelerate harder off a light save time on an ebike vs a pedal bike. When I was commuting on one, I ran the same route as a seriously hardcore recreational cyclist/commuter who held a bunch of records in the area. I'm in decent biking shape, biked (pedal bike) to work for a while before figuring out the ebike thing, and the commute was significantly faster with the ebike. The recreational guy was faster than me in the straights, but I absolutely destroyed him speed-wise up the hill we lived on (big, nasty, steep hill, and even though I could get up it manually, I was soaked in sweat for half an hour after getting home, and pretty cranky - not ideal).
I need to get something built up again. I've got a bunch of parts, just... very few running ebikes. Shoemaker's kids and all. I've got a few BionX kits I need to get assembled for testing purposes - they're R&D hardware for me, but I eventually need to get them on something and figure out how to run them faster than rated speed (rural roads, nobody cares, and 30mph makes a big difference to me).