IMO the TSA friendly bags are most often a pure marketing gimmick. It takes longer to undo the clips and zippers then to simply whip out the computer. And then it takes longer to reassemble the bag. BS idea!!!
The only exception are those rare bags that use a saddle bag style. Basically two bags joined at the top where you just need to spread out the two halves.
Get any bag that you like (Tumi is great but I wouldn't do leather) and then put the MBA in a padded envelop. Ditch the supplied computer sleeve that comes with the bag. It usually takes too much room and weight.
Till