They've had a couple of slipups and here and there and I think their business is struggling, but you can trust that if you buy something on Groupon you almost always get what you paid for. It's a good site and you can trust them.
good site, a lot of product variety, although be careful with signing in to emails as the unsubscribe process is long and not intuitive. I still receive newsletters that I thought I have unsubscribed from long time ago
It's a great site all in all, I do use it sometimes to find interesting stuff to do around my area or discounted tickets to shows and restaurants.
Things I don't like is that they do email A LOT ( you can of course unsubscribe, but I do want to get their emails, just once a week and not 3 times a day). Also, not all deals are children safe, I don't mind that, but I know some might find it offensive (Banana Bunker and others...).