I haven't used First Response but I have heard they are pretty good. I will be purchasing that brand next time.
yep, I think they're fantastic! When I've had BFN's with them, there has always been a good, clear white space. When I've had BFP's, they've always been early (like 10dpo) and accurate. Definitely no ambiguity. I also like the Discover One Step (which at the time I used them seemed almost identical to FR), but they're a bit more expensive for some reason.