I really like mine, it being the first generation alloy version. It’s light enough and rolls well over all terrain. However, I also have an Ice Cream Truck on long term test and it is just more, well, fun. It’s heavier and slower but it is a riot to ride.
I’d be hesitant to try and drop too much weight on the rims by going carbon. Have a look at Dr Jons Wanderings blog to see how poor HED carbon rims are for an awful lot of money. Better to go tubeless and lighter on the tyres if that matters to you. I run Surly rims and they have survived multiple rock strikes from me running my tyres soft.
For the best of all worlds, you might consider getting a Surly Wednesday and outfitting it with Light Bicycle carbon rims which won’t leave you in a state of guttedness should you ever crack one. The Surly rims supplied with it are terrific and would serve you well for a long time.
Hope this helps!