Well I've used this lens over the weekend and my first feeling was ...what a super focal length....with reassuringly standard 50mm like field of view.
As reviews have stated there is vignetting wide open but LR takes care of that with its lens profile ticked.

Shallow DoF requires more consideration of background to subject distance when using for macro due to the short focal length...and when achieved the background is nicely blurred - not harsh or too contrasty but not buttery smooth like the 100L Macro.

Some example scenarios

macro at f11 with good background distance
_MG_0010-3.jpg by brianvickers, on Flickr

and at f8
_MG_0019.jpg by brianvickers, on Flickr

a more regular image at f8
_MG_0004-3.jpg by brianvickers, on Flickr

woodland at f6.3
_MG_0025.jpg by brianvickers, on Flickr

urbanscape at f5.6
_MG_0044-3.jpg by brianvickers, on Flickr

landscape at f2.8
_MG_0005-3.jpg by brianvickers, on Flickr



village scene at f2.8
_MG_0004-2.jpg by brianvickers, on Flickr

its a bit long for selfies! (f6.3)
_MG_0026-3.jpg by brianvickers, on Flickr