I almost pulled the trigger and bought the 40-150 pro lens this morning through the Olympus store. But then I though perhaps I should see it and play in person. Off to the store I went after work. Well, I moved to m43 to get away from the dslr scene because I got tired of carrying around the heavy camera and larger lenses. My E-M1 with the 12-40 is well balanced and comfy. Did not realize the the 40-150 pro was that large.....even though it's small as far as an equivalent 70-200 pro lens goes. Still did not feel well balanced on the E-M1. I think the grip may help with this....but then I'm back in dslr style world again. My main reason for having a telephoto is taking pictures of my son playing soccer, widlife and birds. This lens would be good for that but a little short even with the converter.....so not ideal. It also may not be fast enough for indoor sport such as my daughters basketball, volleyball and swimming. So, guess if I don't go for this lens, my choices are the 75-300ii for outdoor and the 75 1.8 for longer indoor activities. Does this sound right or am I crazy here?