From what I have read here, it is generally thought that the test strips are very inaccurate.
I know that it costs more initially, but the API Freshwater test kit is actually a great value. If you look at how many tests you get, you get a LOT more with the liquid test kits. 10 or less strips is not a lot of tests, and you will pay a good bit for just a few strips. At least the strips were pricey at my local pet stores. I believe that you get "over 80 tests" with the API kit. So, it will last a long time!
Anyway, that is what I know. Maybe someone else will know more about the strips. But again, from what I have read, the strips are really not accurate.