I'm seriously considering an ebike in the next couple of months. Have spent a lot of time googling and keep getting dragged down the - "ooh look thats nice, its only another £xxxx" route" usually starting with a Trek Rail 5 and ending up with £10,000 superbikes.
Yesterday I hired a Trak Rail 5 - gen 2, 626W jobbie. A quick sit on and adjust - set sag, seat height and we're off.
Played with the power settings - ECO, TOUR, EMTB (pedal hard = go hard, pedal soft = go soft), TURBO.
The first two are ok for road stuff as you're limited to 16ish mph any way. EMTB suited me best as Tour was a bit on/off - nothing/max power which was tricky in the tight, nadgery stuff whereas in EMTB (it seems to match your input better).
Both EMTB and Turbo had the power to get up stuff I didn't believe was possible and that was my issue, Ebike riding technique (for me / where I'm at in my head, at the moment, my ebike experience level) is very different to manual riding. e.g stop pedalling to take a dab and it's like hitting the brakes. Several times I didn't think the bike would get up the step/over the rock and a big stamp on the pedal and woosh we're over or in Turbo - the front wheels off the ground or the wheels spun, in EMTB the power input seemed softer/more progressive.
That's possibly where the Gen 2 vs Gen 3 consideration comes into it as I believe the Gen 3 allows you to tailor the power profile, I say possibly as more riding experience may make that a redundant consideration - is it worth £1k / £1.3k price increase, hmmm.
Handling was good, it went where I wanted it to (I don't think I pushed it nearly enough to really tell).
Suspension was the weak link, the fork was hard / harsh. To be fair I didnt check whether the damping was adjustable but if I bought a Rail 5 I'd want to play with the fork settings / improve it/them.
What did I learn, Couchie was quick everywhere on a Rail 5, Weeksy was on the pace everywhere on the antique LIV with crunchy drive train and bouncy suspension, so why would I look any further than a Rail 5 GEN 2?
Well, maybe a GEN 3, oh look the Rail 7 has a better fork and we're back down that rabbit hole from £4000 to £5750.