Buying new closets - need advice

We're buying new closets for 2 kids rooms. I'm not sure whether to have them custom made or to buy ready-made from a furniture (or big box) store.
Of course, custom made is more expensive, but there are a number of advantages:
1.maximizes space, both vertically and horizontally, since it's made exactly according to the wall size.
2.We can pick out the Formica, knobs, wood, pattern, etc. to suit our (my wife's) taste.
But... is it worth it?
Does anyone have advice for us? We'd like to make an educated decision.
  10 answers
Your comment...