First- this site has some really good deals, but you have to read the "rules". It takes awhile for them to fulfill orders as noted on their site because they purchase as a group order after the sale is over- they then receive the items and distribute them with the rest of your order. It would be like you buying from 5 different companies, receiving the items from each company and then remailing them out to a family member.
Most of my orders arrive in about one month. If it's not a GREAT deal- I don't buy from Zulily. I NEVER order shoes for my kids as there are no returns- unless I know the brand well and their size in that brand.
I recently had a defective snap on the cutest snowpants ever. I was a little nervous because they don't offer returns. However, I took a photo and emailed customer service. They responded VERY quickly and apologized, gave me a refund AND a $10 credit towards a future purchase. I was also able to keep the pants as they are not able to exchange (again- they order in a way that is similar to samples).
Customer service is A+, timing is slow, but if you can wait patiently there are some really good deals to be had. If it's not more than a 30% discount- don't bother. But-I have bought Keens at over 50% off, which is unheard of.