<p>I moved from Canon 5D and 7D. My back thanks me, but there are some compromises.<br>
Battery life is poor. I have 4 spares, but 2 is usually enough for 700 shots.<br>
AF is not yet as good as the 7D, but I tend to use single AF plus MF for airshows etc. I will keep playing with the C-AF, but to date I have found it useless. Maybe the 40-150 2.8 will help. I find the 100-300 (Pani) hunts the wrong way first and I have missed shots. I tried the 40-150 and fell in love.<br>
Would I go back to Canon? No as I like the weight and quality, but if I needed full frame the Nikon 750 would be tempting.....</p>