The list below is made up of my favorite Insert sets.  This list is made up of insert cards, excluding any Autographs or Game-Used, (They have there own section). The only requirement is that I have to have the insert set started, in order to count it. 

To me Insert sets serve a two-fold purpose for the card manufacturers.  First, they give the company an indication on how well their product is received.  In other words, they give the company a very good proving ground on future products.  This technique has been used several times.  The 1995 Fleer product included an Insert set named "Flair Preview Insert" for its future Flair Series of cards, (See the Flair page),.  Topps Stadium Club in 1994 had an Insert called "Bowman's Best Preview" for its upcoming 1995 release Bowman's Best.  Secondly, the manufacturers use Insert sets as a way to keep us, the collector's, coming back for more.  How many boxes / packs have you bought trying to put that final Insert set together? 

My Favorite Insert Sets: (Some of these Insert sets are not complete.)

1) 1996 Topps 40th Anniversary Retros - Was this a sharp way to mark an Anniversary!! Way to go Topps!!

2) 1997 Skybox Premium Larger Than Life - The 1997 Skybox Premium had a couple nice Insert cards. This was one of them. 

3) 1994 SP All-Pro Holoviews - I just love these cards!!

4) 1995 Upper Deck Special Edition - Superb Photography.

5) 1997 Ultra Comeback Kids - Nice Touch.

6) 1995 Playoff Absolute Pigskin Previews - Very affordable, Very Cool!!