I dropped BS myself just to get the goggles. Much easyer to get and it'll last for a long time. Not to mention all the other nifty Engy treats.
The armorsmithing breastplate and the engineering goggles are each second-best in the game for effective health for their respective slots, with first places going to Illidan loot for both: [item]Faceplate of the Impenetrable[/item] and [item]Onslaught Chestguard[/item].
Just a heads up to those of you who feel like pushing past 350 engineering. The mats for the Adamantite Rifle (vendor recipe) changed. It used to require 2 thorium tubes among other things (2 addy frame, 4 fel iron bolts) but the thorium tubes ingredient was changed to 3 fel iron casings in patch 2.3. Recipe goes green at 370.