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Biggest concern is the type of plastic is made of. Make sure it won't leach out anything. After that it would be sturdiness, but that looks pretty solid.
Also with that lid you could theoretically just cut out holes for plumbing and load a bunch of rock to grow non photosynthetic sponges.
Get the Tropic Marin Pro hydrometer like mentioned above. I have a refractomter, 2 pinpoint salinty monitors and my Apex probe. They would ask read different even after calibrating. Went with the Hydrometer and only use the other stuff as a quick reference