These ruffled curtains I love are on sale right now at PBK [store] and I'm so tempted to get them. Checked them out in the store and learned there was a Black-Out lined version. I like the more substantial weight, but not sure if it's worth paying more for?

Black-Out:
http://www.potterybarnkids.com/products/ruffle-blackout-panel-white/?pkey=e%7Cruffle%2Bcurtains%7C5%7Cbest%7C0%7C1%7C24%7C%7C2&cm_src=PRODUCTSEARCH||NoFacet-_-NoFacet-_-NoMerchRules-_-

Regular:
http://www.potterybarnkids.com/products/tiered-ruffle-sheer-2012/?pkey=e%7Cruffle%2Bcurtains%7C5%7Cbest%7C0%7C1%7C24%7C%7C5&cm_src=PRODUCTSEARCH||NoFacet-_-NoFacet-_-NoMerchRules-_-

Our nursery has one window and it's the only room that already had mini-blinds too (which we'll keep). Our other rooms have curtains with the black-out liners, which we love! Do you find it helpful to have black-out curtains in the nursery or your LOs rooms? Or did you prefer to have some sunlight in the nursery? If you have mini-blinds, do you think that's close enough to a blackout liner?

Thanks!