The problem I have with vaults is:
1st) Very easily nuke-able, seeing as some people use 3-5 level 4 or 5 lightning spells on just your main resources (presumably gold/dark elixir).. [this only happens if you raid frequently or if your storages are full most of the time].
2nd) If, and I say IF they break through the other compartments, boom all your main resource(s) right down the drain. Although, I rushed my town hall 8 somewhat, so I'll try this out as I advance in my journey of the town hall 8 lifestyle.
Pretty good base overall though, and great job upgrading closed to maxing at lvl 75. :)

