I am with thekettle. I like the lever as it is easy to alter the position so it is comfortable. I have had no issues with any sagging after 15 months. It was a pain to route through an Orange Segment frame but I am not sure any other internal post would have been easier. Setting it up was easy with a hint from the Singletrack review about getting the accuator position right.
My saddle return has always been leisurely but it is one of the earlier ones and I think a new cartridge has speeded it up a little.