Additional levels may be acquired through the use of class mods.
While at first glance this talent may look less efficient than Hardened because it only gives 8% boost to shield per skill point (Hardened gives a 12% boost to HP per skill point), Brick's shield generally takes damage more frequently than his hit points, making this skill more useful than the numbers alone imply. In general, most Brick builds maximize both of these skills to take full advantage of Brick's durability.
Shields typically regenerate at a much faster pace than health. Combining this skill with a shield-focus tank build, maximizing Unbreakable, and a large capacity shield, and with a bit of careful play, it will become very rare for Brick to take significant health damage.
Builds like these are not recommended in player-vs-player against Hunter class characters, as Trespass completely bypasses shielding. Instead, the Hardened skill, Torgue Macho shields, and appropriate COMs will maximize health.