I am a fan of the Avengers and have been since I was young.
I have to say that the blu-ray version is a marked improvement over the long ago video cassette tape version.
But, I have to say that although the image quality is pretty good throughout, there is the same problem with inconsistent color balance; some scenes are too green. There are episodes that are green throughout the whole show and there are episodes where the color balance can shift from scene to scene. I know that film ages and colors fade and shift but, it seems like this could have been corrected, in this day of digital remastering, without too much effort; this is only major disappointment.
Luckily, most of the episodes I like the best look pretty good. I hadn't seen the show in years and the charm and wit of the show still make this show unique and worth watching; the chemistry between Patrick MacNee and Diana Rigg was something special. There are only two seasons with Diana Rigg, the first in black and white and second (this disc set) was the second season which was shot in color.
Well worth the price, it's very entertaining.