We kept getting deals from daily deal sites for Bluum, so at $6 a month, it is generally worth it, though I wouldn't pay anymore. I have gotten it for 7 months so far and have 2 left. I don't think I would get it again even with another deal. Their customer service is terrible.
Citrus Lane was far and away my favorite subscription, but we just discontinued it as my guy is getting old enough that most of what they were sending was duplicates of hand me downs from his brothers and sister. Last month we got 2 sippy cups, a book, a lotion, and I forget what else. The value is usually about double the cost of the box, and everything has always been used.
We got Little Passports for three months. The first month the kids (8, 6, 3, and 1) were excited by it and looked forward to the second month. They opened the package the second month and didn't do anything with it and never even opened the third month. It was mostly stickers to put on the suitcase they got the first month and a picture and something to figure out the next months country.
My big kids LOVE Magic School Bus. It is science experiments that are sent out monthly with everything you need in one envelope. They are actually sitting at the dining room table right now coloring a top and spinning it to see that when you spin it, it looks white even though the full rainbow is colored on it.
We also got Ecocentric mom for one month. It was okay... lots and lots of little samples, but I prefered a few big things from Citrus Lane over a whole bunch of little things from EcoCentric mom.