For basic measures such as ammonia, nitrites, nitrates, and pH, FasTest is the way to go IMO. with the exception of pH, none of these need to be all that accurate. ammonia, and nitrie, if it is there, its bad, regardless of how much. nitrates, it gives a general ballpark figure which is good enough. as for pH, you will get varying opinions on this, but I like the FasTest. It is quick, and accurate. I have compared to a pinpoint monitor, and I get the same results. good enough for me.
on the other hand. the only other elements that i test for are calcium and alkalinity or hardness. These kits do need to be very precise. IMO, as well as many others, Salifert is the way to go. they are a little pricey, and a bit more complicated, but nothing that you cant handle. Its actually more a matter of getting used to following the directions rather than actual comlication.