I use Synchronized SE as my sketching tool. I've abandoned the ensemble libraries, because this one is really quick to set up. Create a track, open Synchron Player, select an instrument. If you, like me, use articulation sets/expression maps, select one, and you are ready to go.
Quick, easy, yet detailed. Very light, but of high sound quality. I think it can live in a final mix, with other sounds or a hybrid context, or a situation requiring less detail than the major libraries.
If you like to compose with ensembles, ensemble strings are there, and you can create ensemble winds with ease. I like it very much.
Paolo