I really wish the LL viewers would include derender because they do so much other really useful stuff like object linking in outfits.
I use phoenix for everything now except to save outfits which i have to load the LL viewer 2 for.
I sure hope phoenix supports meshes when they come out because I can not live without derender any more; and i've kind of given up hope that derender objects and avatars will ever be a feature of the official viewers.
SL is not a comfortable place to be without the ability to derender stuff you don't want to look at.