They're stunning.

I know exactly what you mean about the new 4Ts. I sold the 500s and a few years later wanted another. The 500s were long gone by then so I bought the next best thing, a CRF450R. First rode it and bang, straight into the limiter. Just like a diesel. No real greater bottom end than a 500 but what felt like half the rev range.

I did a few enduros on that. A 450 4 stroke kick only motocross bike with sod all flywheel. Not fun on the slow technical stuff, especially when it threw the teddies out at crawing through the knarley stuff and stopped dead. Kicking it back to life 2.5 hours into a 3 hour enduro was not fun!

Stick to 300 2 strokes these days. Best of all worlds.