I'll confess, I bought some and used them this winter on weeks when I didnt feel like busting out the TF100. They are certainly easy, and mine seemed to be reasonably accurate to the drop tests, but precise they are not.
In my TF100, I know exactly what all of my numbers are.
In my test strips I know:
FC is somewhere between 5-10, ok thats mildly helpful
pH seemed similar to the drop test in terms of readability and preciseness
TA - I know its between 40-80, so I guess that is mildly helpful
Calcium - I can tell its somewhere between 100 and 500, which pretty much tells me nothing.
CYA - Is that color 40, 100, 150 or something in between? Not very valuable info here either.
Bottom line, I'll continue to use the test strips periodically, but only when I'm 99% certain my numbers are good going into the test and I do not have to make any adjustments. In a site dedicated to helping people with their pools based on accurate numbers, there is no way I would recommend them to anyone on here asking for help.