All right, you know the deal, 4 pages, 1 page front cover, 1 page editorial /SRD, leaving 2 pages of content for 7 feats to enhance the shield spell, so let's check them out!
What do the feats do?
-Covering Shield: Extend your shield to an adjacent ally.
-Elemental Shield: Choose an element when casting a shield-spell to gain AC-resistance to the chosen element.
-Force Shielding: Cool feat lest you cast the spell on a physical shield, making it also work against touch attacks and increasing its hardness.
-Reactive Shield: Also get AC-bonus to CMD. Kind a boring.
-Shiels Spell Bash: No we're talking! Execute shield bash maneuvers with the spell! This feat is plain genius!
-Shield Properties: We know that concept already from e.g. mage armor: Add a limited array of shield properties.
-Tower Shield Spell: You can stretch your shield spell to enhance it at the cost of an armor check penalty and hindered attacks - again, a cool concept, though I feel this particular one is rather weak.
Editing and formatting are top-notch, I didn't notice any glitches. Layout adheres to SGG's 3-column standard and the pdf has no bookmarks, but needs none at this length. Honestly, I was somewhat disappointed by this pdf - there are cool ideas herein, but also some that are rather boring and not as clever or complex as I'm accustomed to by SGG. That being said, for a buck, this pdf still has some nice options for you and thus, my final verdict will clock in at a rating of 3.5 stars, rounded up to 4 for the purpose of this platform.
[4 of 5 Stars!]