I'm actually part way through Tom Wishon's 'The search for the perfect club'.

Tom discusses oversized heads. While they offer more MOI at impact (reducing distance lost on off-center hits), it means that they're also more prone to twisting at impact with the same off center hits. Thus, while you'll be closer to the hole, you may very well be much more left-or-right of target than you would with a smaller-headed driver.