I had a chance to ride one at Frostbike last week in MN. I had low expectations, but I came away surprised how much I like it. I am not running out to buy one, but I came away liking it way more than I expected. It looks scary as hell, but once you are on it you certainly forget about it and just got. It takes a little edge off and maybe gives some more confidence without the weight of a sus fork. The real conversation was that the Bluto basically doesn't work in the cold so this becomes a real advantage in the cold.
It was cool to be able to ride 4 & 5" tire bikes, Steel, Alloy and Carbon all back to back. We rode in fresh snow and packed trail.
My personal findings were that Carbon rims made more of a difference in ride quality than frame material.
I was really trying to decide if I could put up with the super wide BB/q-factor on the Ice cream truck and Blackboro.
Tires make or break the ride for sure, but carbon rims make a change that can't be ignored.
As for frame material, I was surprised how much I liked the steel Ice Cream Truck. The carbon Beargrease carbon was still the champ in my eyes.
And yes, the bucksaw is a freaking blast.