This Bullet Point-pdf is 4 pages long, 1 page front cover, 1 page editorial/SRD, 2 pages of content, so let's check this out!
Presenting us with 10 feats to modify the mage armor spell, here we go:
-Defensive Spell Focus: When you cast a spell that grants you AC, you get an additional 1 AC.
-Deflective Armor: Apply force-based AC-bonuses also on your touch attack AC.
-Eldritch Armor: When under the protection of a mage armor (or similar effect), you add the AC bonus to the DC of dispelling attempts made towards your person and worn equipment.
-Explosive Mage Armor: Allows you dismiss an AC-granting force effect to break binds that tie you or escape grapples and similar predicaments. Cool idea and iconic imagery.
-Heighten Mage Armor (Metamagic): Increases the effective level of the mage armor and allows you to get 1 AC for every 1 spell level you make the spell. VERY cool mechanically, as it keeps the spell useful at higher levels - somewhat resembling the psionic system being applied to vancian casting. Two thumbs up!
-Mage Armor Properties: reduce a mage armor's AC bonus of up to 50% and grant it magic armor properties instead - I only wished that more armor qualities would be available - as written, only 5 different ones can be traded in via this feat.
-Shapeable Mage Armor: Either make it harder to confirm criticals or grant your mage armor a locked gauntlet, armor spikes or even use it to slightly improve regular armor, filling in the gaps. Now this is a useful, versatile feat.
-Slick Armor: Casting takes longer, but the armor grants you its bonus to CMD vs. grapple and escape artist checks.
-Summoner Armor: You can cast mage armor at short range on summoned creatures and may add the spell as a swift action to a summoned creature of yours. Very cool and something especially summoners (d'unh) will enjoy.
-Witch Armor: Your Mage Armor also grants you half its bonus as resistance bonus to saving throws against supernatural abilities.
Editing and formatting are top-notch, I didn't notice any glitches. Layout adheres to SGG's 3-column standard and is crisp and no-frills. The b/w-artwork is nice, the CGI on the cover isn't. The pdf has no bookmarks, but needs none at this length. This pdf provides us with several rock solid options to improve the life-span of the classic mage armor spells and while not all of the feats are as awesome as Shapeable Mage Armor or Summoner Armor, they do provide logical and valid choices for PCs to take and best of all, keep the spell a valid option throughout the levels. Seeing that I don't have any balance-concerns or gripes, I'll settle for a final verdict of 5 stars.