I've had two electric bikes in my time, but not that brand. I bought the first for rehab after foot surgery, and bought the second to replace the first. The idea behind using the electric bike for rehab was to pedal as far as I could, and if I overestimated my endurance I still had the electric motor to get me back home. Now that I'm retired, my budget won't stand the expense of buying another, especially one like the Evelo that costs over two grand.
For both of my electric bikes, I had to get rid of them when the batteries worse out and I couldn't buy replacements. So a word of advice, if they offer spare battery packs, make sure you get one! An electric bike with no battery is just a regular bike that's harder than usual to pedal.
Engineering: Finding complex solutions to simple problems you didn't even know you had.