It's easier. You don't need to mix multiple reagents, shake vials, count or measure drops, figure out if the test solution is blue or still kinda purple-ish blue. You put 4ml of tank water in the cup, dip a strip in the cup, wait a few seconds for the result, and you're done.
Ease of use wouldn't matter if it wasn't precise, but I've found that it is. The accuracy seems, at the very least, on par with current test kits. Personally, I don't care much about accuracy for most tests. I want precision and consistency so I can measure trends. The exception, for me, is copper. I want that to be accurate, but you can't possibly do worse than the hobby grade copper test kits currently on the market.
It's just another tool. Some may find value in it, others may not. I like the fact that it's backed by an established company that specializes in water testing. They aren't trying to sell supplements or salt and they are likely to be around for a while to support their product and that's important when a device relies on consumables to function.