Is goodrx.com Safe?

Saved me over $300 on just my last scrip alone at my local Safeway. A generic form of a very popular medication just became legal in the United States. I shopped around on this site and got THIRTY 20 mg pills from my local Safeway's pharmacy for $18.20. These pills are pretty much never covered by insurance. Note: you MUST look this drug up by its generic name, and look for the 20 mg pills. Others, e.g. 100mg are $thousands. They're even cheaper if you can get a scrip for a 100-pill quantity - < 39¢ each. They were about $10 each 'till this year. (The pharmacist had to call the # on the coupon to get it to work.)