625 is my bottom line price. I love this lens. Shot with it again today, and it is simply spectacular.
Here is the ring shot I did a couple weeks ago that Viet is talking about.

Manual focused
580 EX II bounced off ceiling for fill
ISO 800
F/2.8
1/200th
5D Mark II
I'm totally happy to keep this lens. If I sell it, I am getting the 100mm 2.8L Macro IS. I have no real reason to sell it, other than I would love to have that IS macro.
I only use my macro for detail shots at weddings, which amounts to about 20 frames per wedding, give or take.