Reliable QR code generator (for Customer Feedback Survey)

Has anyone used QR codes to get feedback from customers? Seems this has worked well lately. In case you did, which QR code generator did you use? Would appreciate hearing from someone's personal experience. Thanks in advance! Basically, the generator you used and found reliable.

Did the search best qr code generator for business, a couple of names popped up. There's QR Code Monkey that doesn't look bad and Beaconstac has great reviews on G2. I read a bunch of posts from people complaining...

Reliable QR code generator (for Customer Feedback Survey) WordPress ...