I really don't have a problem with the approach, just the price. I've been paying Adobe about $200 every two years to download the latest Photoshop upgrade. Now, at $20 / month to maintain a single product via the cloud, that is a big price increase. I suppose if you are just getting into Photoshop, you have the advantage of beating the initial big ($700?) charge for Photoshop, so newbies make out (for awhile). The long time users (like me) don't get this benefit. They will give me a $10 / month deal for the first year if I sign up quickly - big deal! But in the end, what are you going to do? Can I use all my plug-ins with GIMP? I don't think so. Will some enterprising competitor emerge? I hope so. I'm also wondering about Lightroom - will that remain a standalone product or if I end up with Photoshop CC can I also get Lighroom bundled in as a CC product at a reasonable price (Lightroom is bundled in with the big CC package at a big price).
I am 2 for 2 with dud Sigma lenses, including a 150mm OS Macro which will periodically decide to have problems with autofocus and with image stabilization. I won't buy any more Ford cars and I won't buy any more Sigma lenses, particularly when there are reasonable alternatives from Canon and Nikon. The specs for this lens look good, but Sigma does not have adequate quality control.