Yes, I have Hach test strips I use (gasp!) as a go-no-go test of chlorine in my pool. I cannot trust the TC (frequently lower than FC, an impossibility), the TA, or the pH. The CYA test hasn't once said I've had any CYA when it's been as high as 35ppm. For me, strips are the canary in the coal mine, no more.

Carl