There have definitely been a lot of complaints about the Hanna Calcium Checker, and plenty of praise for the Hanna Phosphate Checker. Murdoch brings up a good point that the alkalinity test is very simple (with any brand). I haven't tried any of the Hanna Checkers since I have been very happy with results of the different (and cheaper!) test kits I currently use.
My preferred test kits with second choice in brackets:
Calcium - Elos (API)
Alkalinity - Elos (API)
Magnesium - Salifert
Nitrate - API (Salifert)
Ammonia - API
Phosphate - D-D Merck
pH - handheld meter only, test kits are garbage.
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~ Mindy
SPS fanatic.
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