I don't. None of my friends do. Most "deals" are just a way for any company to "bait and switch" or to act so grudgingly that they make you feel you are stealing from them. No thanks. Paying a few percentage points higher for a non-discounted service allows me the right to #$%$ if the service is poor or workmanship is shoddy.
Sentiment: Strong Sell
I've actually used more. Stopped using last year but then the new deals are better. The goods deals are even better. I bought 2 comforters, 2 iPad cover sets and several restaurant deals this month alone. I find them good value and no shipping fees.
Use it probably every other week, I love people that thank all that it is, is coupons. They are selling everything from baby food to high end TV's. also you no longer have to buy the coupons with their reserve app restaurants give you a discount just by booking through groupon. Groupon has found a way to inject their service into every part of your life. From the food you eat to the clothes you wear. The things you use in your house and some out. Even the vacations you go on. It is probably the most comprehensive site\app available for someone the save on the things they care about and use.
Don't be that #$%$ at the craps table playing the don't pass line when the roller starts hitting points. Groupon is a freight train and i would advise you if you are in fact short, cover and get out of this trains way. There is way too much money behind groupon and they have way to much momentum for it to fail.