Conclusion: Bottom line : Usable for those times when you need to go wide, but be prepared for some learning curve getting the composition and focus points adjusted to your satisfaction. Also, not as good as the E63.
Pros: Focusing . It'll take you some work to figure out how to achieve the best depth of field with this lens., Performance . Not as good as the E63 in any respect, though not terrible, like some third-party converters., Composition. If you can't see the color LCD, you won't be able to set up your shots using a converter. It's very difficult to judge fine detail.