The augment makes it totally worth it. "Augment shellra V" wich add 5 MDT per merit (not 100% sure of this one yet).
The Augment Shellra V is really good, but I doubt it'd be THAT good xD If that were the case, you'd be looking at capped MDT in a single cast of Shellra V with these babies on. I think it's more reasonable to assume that it's an additional 1 MDT per merit to a cap of 5.
But if there's evidence to support a 5 MDT per merit, holy crap Batman! O-o
On my alt I use Blessed Briault with my bar-spell set, Wiki claims it gives an additional +5 MDB to your spells. (I would buy the +1 if I was sure it gave more MDB to bar-spells.)
Anyone else use this and/or have a preference?
AF3+2 body with Afflatus Solace up gives +10 MDB on your Bar- spells, if I recall correctly, making it generally the more ideal body to cast Bar- spells in.