Extracto: Well, I do agree with the rest of the reviews; It is a really good lens and you will get some really nice images using it! The connection between the 100 mm's and the 2.8 aperture gives you a fantastic range of possibilities.
Resumen: Solid when locked with no give, but moves smoothly when loosened. Works fine with a Manfrotto 200PL-14 plate. A little less clearance than with the tripod ring for the 70-200 f/4 which I could rotate 180 dog to get it out of the way on a 7D - can't with this.
A favor: Good Footing, Locks In Tight, Smooth Movement