Red Sea Test Kits

What is the word on the Red Sea test kits?  Are they accurate?  I am
considering buying the iron and phosphate test kits they have because Tetra
does not make these kits.  The phosphate kit has a range of 0.1 - 3.0 ppm.
How important do you think phosphate testing is for a planted tank?  If you
have any experience with Red Sea iron, phosphate, KH, GH, and CO2 tests
please tell me what you think.  Thank you.

"There are always exceptions to the rules"