The good: excellent selection, fairly reliable delivery, good customer service and replacement or credit. The not-so-good: website is a little clunky, and one slip can erase all your selections!
I ordered a little bookshelf. The charge for "white glove" delivery was very high, but it took over 6 weeks, and they sent it to the wrong address at first! Too much of a hassle and not tremendous value. I'm not rushing back.
Half the deals aren't really good deals; the other half have so many conditions as to make them impossible. I used to like Groupon but have soured on it.
E-delivery of tickets and awesome deals on NYC cultural life make this site a must. If you work for a not-for-profit, are a teacher, or many other qualifications, you can join.
Usually love what they send, and I def like that one shipping fee is good for a month, return labels are in the boxes, and they have a generous return time frame.