Image quality is fine. Very sharp. AF hunts a little bit sometimes. HUGE flare issue when its wide open (understandably), but that dissipates at f's tighter than 2.2 or so.
I think it may just be that I'm so used to a more versatile arrangement of glass hanging off the front of the camera that I feel a little bit restricted. The digital conversion means this is essentially a 75mm lens, and is therefore not as wide as I remember a 50mm lens being.
It'll be a good portrait lens. It'll also do well with a stack of extension tubes behind it for macro stuff...especially in bright lighting.
Here's one of the first pics I shot: