If I could write two reviews, one would be a 5 (found me great savings on Roamans) and the other would be a 1 (slowed everything down and made every move frustrating on Instacart without finding any deals). On Amazon so far, for things I've shopped for since installing it, it's slowed things only a little (4) and found no savings (1). If there's a way to configure it to lay off Instacart or other sites where it's just a pain, and go ahead and run on sites where it's helpful and/or doesn't slow things down unduly, then I'll be a lot happier with it.