Actually I've had it now for about two weeks. I traded in my Nikon 500mm f4 and released the two Sherpas that I hired to carry it. I can now get closer to birds in a more graceful and less threatening manner - a slow walk. Moving closer with the larger 500mm mounted on a substantial tripod was very awkward and time consuming; now I just slowly get closer, with the camera at the ready.
I only had to wait about 6 months for the new lens and the lens itself is living up to all of its wonderful reviews. I am a happy camper, confident that I made the right choice by switching lenses.

Be glad to. First of all is my amazing Canon macro EF 100mm lens. Shoots great in low light. My favorite time to shoot is 5 until dark. The light is wonderful at this time. And I love the light of an incoming storm. Actually I would say almost effortlessly. I let my camera find my shots. I look through the lens and float and move my camera about. Something will catch my eye,take my breath and there is my shot. I get down low and shoot up and through and into plants. I watch for blowouts. Light too bright on leaves, etc. and try to adjust view. I use a circular polarizer just about all of the time and I keep my exposure comp. at usually -1. Only in winter do I "set up". In this situation I use window light, late evening or low light from a lamp. Again I go into the plant or flower arrangement, letting my camera find the shot. It is there always. Multiple shots. I use LR for PP. My favorite adjustments are clarity, vibrance, contrast, sharpening-all with a light touch. I have a set of presets that I enjoy as well as save time. One quirk I find so important is to shoot vertically quite often as this gives long flower stems, etc., a natural flow. Nothing worse to me than a beautiful stem shot horizontally. You lose the rhythm totally. Flowers need to dance, flow, be natural. Not stiff and cropped too close. A natural environment of the plant, bush, tree gives great flow opportunity. Sometimes you have to center the bloom and it can look good, but most times go along the lines of your subject. Straight down into a bloom can work, but again more rhythm comes shooting at an angle across a bloom. I could go on and on as I love it so. Hope some of this helps and hope it makes sense to you. Sandy Oh, also important, I use aperture and most of the time choose 4. Then roll the manual focus until I get a look I like.