I watched the first 2 discs and plan to watch the rest of the series sometime. I wouldn't recommend watching too many episodes in a row; they are fairly good, but the format grows tiresome. Spread them out over a period of time, and you will enjoy them much more.
I simply love this series. I wished it had lasted several season. I keep watching them over again. All those great stars and the best stars are Jim Hutton and David Wayne. This show means so much to me.