2. Has the Katzeye a self installing option too? Easy? Advantages towards focusingscreens.com ?
I can answer in a few weeks, if you don't mind the wait.Katzeye
"However, the Canon 7D focusing screen is not designed to be user changeable and the procedure is only recommended to be performed by a professional camera technician. No tools or technical support for installation issues will be provided. An installation guide is available for download here, but this should not be construed as endorsement of customer-installation of the screen — this guide is intended for professional use only!"
In short, you can do it yourself, but don't whinge to us or blame us (or ask for repair money) if you cock it up. I'm an electronic engineer with experience in service and repair, so I'm confident I can do it without breaking too much. But if you're not me, you value your camera more, or trust yourself less, and can do without your camera for a few weeks, send it to them (or buy it and get a local camera-techie to do it).
ps, it's http://www.focusingscreen.com/,
i'd never heard of them before but i'm checking them out now, they look to be cheaper and have a lot more to choose from, horizontal/vertical/diagonal/double split prisms, with or without microprisms. They also seem to have a few of each in stock, KatzEye is made-to-order so they're running a few weeks behind. They don't have an equivalent of KatzEye's OptiBrite though, i've got lenses down to f/5.6 (or worse with teleconverters) so the Optibrite will probably be fairly useful for me...