Thanks -- I usually don't watch videos as I (generally) find it annoying how slowly they present actual information vs a written article I can easily skim through and then focus on the relevant info.If you watch Max Yuryev's video you can use the difference between the 2.2 (with the 555X) and the 2.6/2.9 (with the 560X) as what you get for the $100.
Now that I've gone through the video I see there's a definite difference for video work. Which I don't do any of... So no benefit to what I do.