The original newspaper strips are available to view at various sites across the web, with one inparticular showing one strip per day in the same way they were done back in the day....
http://dailysw.blogspot.co.uk/
I know that they do not show the format printed in the Classic Star Wars or Classic Star Wars - The Early Adventures, but at least you can judge for yourself if they are worth getting or not.
The only answer by the way is "Yes they are worth getting"
Anything with the original Star Wars film cast in it is 10 times better than anything with any other characters in it, which makes them better than most of the last 10 years of Dark Horse output in my very humble opinion.