I'm waiting for the Crest's, they're apparently as strong as a 355, 2mm wider and weight 40g less… I think the weight saving comes about mostly because the sidewalls are shorter because there isn't a braking surface, they're also supposed to make tyres seal easier.
I'm about 75kg, so thinking about getting Pro3 XC3's; they're going on my SS, which does lots of road miles and doesn't ever have to deal with anything more than a few roots.
I'm hoping they'll be a few people wanting Crests when they're available, so we can sort out another group-buy.