If you want a color slide look but prefer the ease of C-41 processing or like a little more exposure latitude, this film in the best affordable alternative. I didn't like it at first due to the redness, but you just have to know how to use it. Works well in softer light and for landscapes. The grain is very fine.
I will confess that I shoot black and white film three times more than color. I "see" in black and white. But, in order to grow as a photographer I have been trying to shoot more color. Ektar 100 is very nice. The "grain" is tiny and color saturation is good. It is, however, high on the red side. The high red factor makes portraits challenging for me so I use it for architectural and landscape photography. I shot it using an EOS 3 simply because I wanted to see the results from a professional Canon camera and my A series are considered more "prosumer". (Although I think the A-1 is superior to the F-1.) I have only shot 35mm with this film.