I'm tooling up the older of my two Downtube IXFS's for the Smithfield Nocturne - higher gearing, drop bars, bar end friction shifter, and better tyres. I have a great love for the Marathons, and I was going to go for the 1.5 version in order to get 100 psi capability (despite what anyone says, I have great faith in high pressure). They're not easy to find in the UK right now, and I'm wondering about the Marathon Racer. Apparently a lot lighter, and still with good puncture protection (this bike isn't about to become an out and out racer - it's a one race deal, and I still want a useable commuting/touring folder afterwards).
So, who has experience? Are they notably faster than Marathons? How is the puncture protection?