One disappointment is that auto focus doesn't work with this lens and adaptor but on the other hand most of the stuff is better using manual focus, especially when there's a bird behind branches.
Looking at the LCD on the camera after taking the shots I wasn't happy but getting on the big screen they seem so much better.
All shots taken were handheld, ISO at 800, the lens at full stretch is 300mm, camera has a crop factor of 1.5 which gives it an effective zoom of 450mm, so with the adaptor that gives about 630mm.
The Sony A390 used may not be the best camera in the world but it really works well and with that amount of cheap lenses available is a brilliant piece of kit.
The Great Crested Grebe was really far away and was just a small spec in the middle of the picture, it's not good But I'm really happy with the quality.