I havnt tried their reef care suppliments but i will say i have their new foundations kit which tests for Cal, Alk, Mag, i have their reef colors pro test(i forget the exact name) that tests for iodine, iron, Potassium, and lastly i got their phosphate test kit and i was using API previously and salfert and so i dont have much to base my expierience with test kits on but the phosphate test isnt all that bad and i am hopefully not going to need it once i replace my RO/DI filters and membrane and i did not like the colors kit because it was just alot of work for a test besides thier iodine test which wasnt to hard and i just tested the foundations kit and it wasnt too bad and i usually only test for calc, and Alk as i have 2 sps dominent tanks and unfortunetly phosphates but I just got that PO4X4 phosphate remover and i must say it does work well since i had tested my 55 gallon frag tank 2 days ago and it was at 0.20ppm and i ran some in a TLF phospban reactor 150 and by the end of the day i was down to 0.04ppm now it could have been some of the poly filter pads i have but they were pretty old but the PO4X4 is way to small i have "the Bag" by seachem rubberbanded to the outflow tube so i dont have pellets loose in my tank..dont know if this helped but their tests work they are just a bit of work and i am gonna switch to some Hanna digital testers.