I do like the looks of the dark earth/ tan frames. They seem like they wouldn't show up as easy under a lighter colored shirt.
the only negative I can think of is they look even more like a toy gun than the normal black poly gun.
The OSS owners manual refers to a 4" barrel version. Unless you just prefer Heinie sights and have an aversion to ambidextrious safety and a decocker, why not look for the 4" barrel version of the OSS? It may not be on the shelves yet but I am guessing soon, since the 5" version finally showed.