I like the idea of those 4-in-1 convertible cribs, the kind that go from crib to toddler bed to day bed to full size bed.  Seems logical to have something so multi-functional.  I'm worried that the upfront cost of the crib and the conversion kits are too expensive, or that the storage of the conversion kits will be a pain (we live in a small house), or that a piece will break along the way rendering the whole thing useless... for those of you who have one, considered one, or wish they had one - would you say they are worth it?  Thanks!