For me it's not about top speed (I start shiting it when bike goes much over 22mph even on a good road), but hills, 1500W breezes up any hill of any length at speed, I can draw 1800W from the KT controller going up Gardner St in west end (the really steep hill from Taggart credits)!
Why I love the rear hub, no fannying around with gears, just pedal in assist 5 and the hill has been destroyed...!
I absolutely get that. As well as electric bikes, I also ride motorbikes - these days only 125, 250 and a 350. Bigger and they get too heavy to move around un-powered, now that I am 73, and they are pretty hard to pick up if they chance to fall over, which one did about eight months ago.
Point is though with your 1500 watt e-bike, if some policeman comes and takes a close look at your 'Bigyin'..... I don't know if you have a driving license - you very likely do, and what happens when you renew your car insurance. A fifty cc moped will have all the power your 1500 watt motor has and all you need do is shell out a few quid for car tax, insurance and maybe an mot. It's not a lot, and you have no more worry.
Better still - there are real small motorike bargains to be had if you've done your test. I've put this picture up a few times of my old Honda 250. ALWAYS walks through the mot and I paid £650 for it about four years ago. It had 12000 miles on it when I bought it, and driven the way I drive it and with regular oil changes it will last 100,000 miles. It does high 90s to the gallon and about 80mpg if you ride it hard.
It is in EVERY way better at speed than a bicycle and it has the torque and power to fly up any hill without even noticing it. It has good lights, good brakes and proper tyres for speed. I toddle around country lanes on it with the throttle almost closed.
Note - the discussion about mpg in the video is supported by the fact that on filling the bike, you can see it took 4.9 litres and you can see the trip meter is at 112.9 miles. I reset the trip every time I fill up. That comes out at 104.6mpg.