I do not have Smart Pricing turned on because I think I am smarter about my area than Air BNB is at this time. I live near Palm Springs, CA USA and there are several very high profile events that happen here. I look at other similar listings in my area and base my pricing on my investigation.
I have instant book on and it has not been a problem for me except one time when I didn't realize someone would book a year in advance for a big tennis tournament. I hadn't adjusted my rates that far in advance. I am now more vigilant about advanced booking.