Rad has many happy customers but their count of known problems posts on the brand forum is 275. They have a reputation of responsive service, but if one stretches the spokes their policy of shipping one spoke at a time costed one owner $70 for trueing the wheel over & over again since she couldn't do it herself.
Electric Bike Company brand have a count of 4 known problems today. They also have geared hub motors with throttle for jackrabbit starts across multilane highways that the timer sensors won't acknowledge bicycle presence to stretch the green. EBC models have 7 speed sprocket clusters that could extend your chain life to the 5000 miles I'm experiencing with that width chain. The frames are also one size fits all (maybe, but not me). The tires are 24" diameter, one model with 3" cross section for better ride. I would buy the optional larger battery to reduce the number of times I had to charge it.
If you don't have frequent stops or long hills EBC had a Direct Drive hub motor model which offers the chance of 10000 miles or more without motor service. The bearings are a common lawnmower size and are available in real steel (Argentina) from SK via MSCdirect. Unfortunately the DD drive model had a rediculous price.
Surface604 has 30 known problems today. They also have geared hub motor with the throttle, but also have torque sensing for the feel of a bike that makes you feel more powerful instead of forcing you to a known speed with cadence sensor (many brands are too fast in PAS1). The tires are 27.5", good maybe for taller people. The mountain bike model has a 9 speed sprocket, which offers the necessity to change the chain every 1500-2000 miles. Surface604 has a bafang hub motor, which offers sometimes the ability to buy replacement internal gear sets. I wore out my first hub motor gearset at ~4500 miles, an ebikeling model. I do keep a spare motor in a wheel in my garage, for 1 day turnaround if I wear out a motor. I rode home the one with worn gears, no drag unpowered.
If you think you might stop to bring home groceries, pet food or building supplies, Blix has a stretch frame cargo model, the Packa. They have one known problem today. I carry a 6'x1/2" Stainless Steel cable in my 22" pannier to lock up to electric poles & gas meters, instead of the easy-cut racks cities & stores provide. I carry a good set of tools (not for chain), 3 tubes, tire, rain & cold gear, 60 oz water summer. Packa also has a geared hub motor & 24" tires. They have a dual battery option. I live off my cargo model in the avatar (yuba bodaboda, for small people), doing without a car unless I buy a tractor implement or 12' piece of lumber, when I rent a U-haul truck. I carried 5 gallons of weed killer last summer to my summer camp,also 7 gallons of water, 60 lb groceries every week, and two weeks ago I carried 50 lb of shingles from Lowes for my home.
