One step early result pregnancy test. Are they a load of crap?

Kirsty

I've got about 6 left of these tests which are supposed to tell you up to 6 days early. However I've been reading online a lot of reviews where people have said they have just received negatives up until period is due then bought a different brand and it been positive.

Has anyone had any problems with this brand of test? I'm worried now that I should of just bought first response and spent a bit more money.