The bluray release would be a double dip if they had simply upconverted the entire series. This is the entire series 'rebuilt from the ground up'. I can't consider that a double dip, not when we've never seen the series looking so amazing, and when CBS are putting so much work into restoring the show in a way we thought wouldn't be possible.
The BOBW single disk is a double dip, but the Season releases are not.
Yeah I'm with you on this, the Blu Ray seasons are an excellent addition to my collection, and look fantastic in HD. I probably won't get BOBW just yet until it is cheaper (and that's only for my collection - the minor extras that have been mentioned don't thrill me).