5' to flat, not me...
I did a 4' to flat, but wouldn't do it again on a 575 without a DHX Air. It is a lightweight frame, but thats not what bothered me, the 5th Element Air I had on mine cried out in pain, and a few weeks later, after a few more drops, I had to replace the interior plastic shock eyelets with metal ones. I think with a DHX Air on there, 5 footers to tranny regularly would be fine, but any bike 5' to flat regularly will have its issues, maybe not with the frame, but with the wheels, etc.
Of course, a lot has to do with your smoothness level. If you are as smooth as I am on drops, as in smooth as a dumptruck driving through a nitro glycerine plant, you might want a bit bigger bike for those drops.
The ano finish won't take it either, try the raw, its tougher...
