I still enjoy watching this show and will certainly buy this set for my collection, but I should say that this season is by far not the best. For anyone who is new to the show: buy either season 1,2 or 3. Those episodes were hilarious!
After having been on the air for so many years, one just can't expect That '70s Show to still have fresh ideas all the time.
The plotlines really are less interesting and significant this time around. All of the characters are grown up now and they lack the on-screen chemistry they used to have.
However- It is still worth purchasing, for the fans, because it's the last season with the entire cast still intact before Eric and Kelso leave in Season 8.