I went to Cornwall (UK) to see the 11 Aug 1999 Eclipse with a group of friends. We all sat on the clifftops of Treyarnon Bay and watched the 100% cloud cover go dark, then light again. Very frustrating, but was a fun 2 week motorcycling holiday on my old '86 C10 "Sanji".
I saw it today. 80% sun covered here. It was strange- clear sky, sun shining, looked mostly normal, except not as bright and the direct sun was not that hot. The eyes will adjust, making the 80% loss of light barely noticeable.
Used the special filters and it looked like a crescent moon (a co-worker had a safe pair she was letting people look).
Might be the most solar eclipse I ever see in my lifetime.