They seemed fairly accurate.

They're not packaged as well as the API test strips I used later - the API container is a flip top and contains a desiccant layer internally. This product is packaged in a plastic bottle with a separate desiccant package inside.

The colours didn't "wash out" in the water as much as the API tests did and seemed easier to read. However the nitrate reading wandered from 0 to 10, it was hard to tell them apart and it seemed to drift between the two for no apparent reason.

Probably best to stick to liquid tests and keep these for emergencies...although they're a little bit pricey to just keep sitting around and they do have a limited shelf life (something like 1 year).