I want to mention right up-front that I'm not using these as they were intended for, but I do have experience with lighting and am certain that these will bring very decent results for correcting, coloring and adjusting incandescent and other lights.
Very even color as expected - this is definitely the good stuff.
I have a control surface in my music studio which has a non dimmable segment lcd display. It's too bright, so I bought this set of gels to cut to size and lay in front of it. They were covering the width of the display perfectly and it was cheaper than buying a full roll of ND filter, + I liked the idea of testing different colors rather than just darkening it.
And I did actually end up using two of the CTO gels instead of the ND.
So, I recommend these to anyone who wishes to test the variety of colors for lighting, or wants to get rid of eye strain in the studio.