Inworldz - especially if you are a builder or creator. This opensim based world looks alot like an older version of Second Life but is bang up to date with a mesh enabled viewer.
As a builder, creator or land owner the benefits are obvious - uploads are free and sims are $75 USD with 45K prims , also a 5000! group limit. - Take into account though when selling your I'z -(the Inworldz currency ) 500 is equivalent to $1 compared with Second Life's Lindens - 263 = $1. (current selling values)
SF Design has had a mainstore in Inworldz since 2010 and we also have a presence in the wonderful Mimi Juneau's store there too.
Since creating my own mesh I have been able to take several outfits to Inworldz and am planning more.
The latest items there include the sf design Alice high heels with feet (not mesh)- complete with new hud giving you great options for colour change.
Check out our store here -http://places.inworldz.com/SF%20Design/135/72/35