Been using an E-Bike for the last 6 years, this is my second E-Bike . The first one got nicked. That's a warning too.
Buy a bike from the LBS that you trust. Also need to know that they know what they are doing
Need confidence in the manufacturer. Not least that they will last longer than the warranty.
Look for simplicity. Understand what the electronics do and don't do.
Range is a personal thing, gearing too. I've found 70km works for me. I have a second battery but that complicates life.
My second bike is a Cowboy. A Belgian brand that has had its fair share of challenges
My bike is a good, comfortable every day bike. At 16 kg you don't want to carry it far.
The killer is that the material of some of the components are under specced. Either to save weight or cost. Or the supplier was a bit tricky.
The whole bike needs your mobile phone to manage it. Repeated iterations of the App have generally been for the better.
But when you want to leave home and catch a train it can be a pain to suddenly have to fight to avoid an upgrade just then.
The consumption of the App can be a big challenge when the signal is bad, or your phone battery is running flat
There is a way of hot booting it. But that requires the keys and a degree of luck.
Also when the battery is flat it is a complete dead weight to propel, without the relief of gears.
I find the geometry comfortable to ride. Other plusses, for me, are a belt drive and no gears. Disc brakes are good too.
I added removable pedals, great for the train and small hotel rooms. A Slimstem simplifies life in compact spaces too.
Or you can buy the cheapest bike possible and hope...