that was opensim I think with a custom client, and problem with the flexi sculpts there, is that, flexi in SL is only a 4x4 mesh I belive, while the ones in opensim use all 32x32, so it'd be hella laggy with the ammount of flexies that are around you on a normal day. LL are still stuck on how to make flexi sculpts that look good, but use as few vertices as possible. Personally I'd rather have collition detecting flexi and the abbility to attach other prims to the flex part of a flexi then flexi sculpts.