Ran my last half in my Evo II's; pretty damn cool they are too :¬) I also have a pair of Aqua Lites. Both models are nice and weigh practically nothing.
Funny thing, In contrast to Squeakz I found the Merrell soles to be too thick!
I think VFFs are ghastly (how they feel on my feet AND the look).
Anyway, both Merrell and VivoB' have loads of great reviews and, as Squeakz says, do take the warnings seriously. Make sure to read LOTS on how to start (slowly).