Yes, I noticed the decline in quality yesterday with these: 1. The answers got very concise, maybe even curt. 2. It cited books that didn't exist as reference

Yes, I noticed the decline in quality yesterday with these: 1. The answers got very concise, maybe even curt. 2. It cited books that didn't exist as references. As for speed, I don't notice any difference. It may be due to my timezone being different from most English speakers.