I've demoed a Specy Turbo Levo SL (the lowest end aluminum version). It was awesome. We rode in a group with 2 e-bikes and 4 or so regular bikes. The e-bikes were definitely faster, but not the point that it wasn't fun riding in a mixed group.
To address WLemke's speculation about weight and technical climbs, I think it puts more focus on balance, timing, line choice, ya know...bike handling skills. The power is there for you, but that heavy bike makes a mistake in bike handling go south quick. If you are a good bike handler already, you'll crush it on an e-bike. Hammering the flats is probably not as much of an advantage on the e-bike. That heavy bike and those loose corners require you to keep it under top speed.
It wouldn't be my only bike, but I'd love to have one in the stable.