Just bought one myself. Shop around and you can pick one up for £130.
It’s not as warm as other jackets I’ve owned, but it breaths so well – russl nailed it with “first coat I’ve ever had that’s not drenched inside when I take it off”.
Vents are great, and are cleverly place not to interfere with camelbak straps.
I’m usually on the medium/large cusp, and medium is good for me.
Love mine. Thoroughly recommended.