Yeah. No matter what, vibrating adaptors have better performance due to reduced grain - cept for the case of the movietube, but even people's opinion on that differs. The Letus FE is great coz it flips the image as well, and there's been alot of great footage shot by it.
The letus FE has been buried by the "Apple Like" hype that the Xtreme has created. The Brothers Le, in their wisdom, have not discontinued the FE for a reason. It is a very good adapter...For the Money its a great adapter. I don't know the other adapter you mentioned, but the Letus FE has been used on dozens of my shoots with great results. It is a budget minded adapter, but the images are great and the Letus team has proven to have great customer service.
I have ordered an Xtreme, but I have nothing but good things to say about the FE.