Hmm... The problem is, that first bit DOES sound like she whole-heartedly supports Groupon by calling it 'guaranteed'. Even after reading the entire thing (not the shortened one) a few times, I wasn't sure what her stance was.
Personally, I think they have a good service, provided you know what you're doing, know how you're going to keep these new customers, etc etc. If you don't, it's a disaster waiting to happen.