Ha! That sounds a lot like my transition to Sera a long time ago. Started with my reef rigs when I could no longer rely on API, Seachem and the other 'cheap' ones. And Salifert is just too spendy.
I was initially lured in by the large test tubes but stuck with them because they just work. A few screwball readings from cheap kits will really burn you (really, my pH is 6.5 in a reef with 200lbs of aragonite? I'm so sure, API, heh).
The GH/KH kits are my absolute favorite and are maybe the easiest to read hardness kits I've ever used.