I don't have experience with it, but I have experience with instant ocean and I hate it. IO has an alk of 12 and calcium of 350...which kinda sucks. I mean, it's fine, but if you have a reef tank, I don't recommend it. Here is a chart (I didn't make it, but it is still helpful). I hope it is easy to read, I tried my best.
..............................................Calcium..Alkalinity...Magnesium
Aquatic Gardens. . . . . . . . . . . . .430..........8............1240
CoraLife....................................560..........9............1380
Crystal Sea Marinemix..................340..........9............1050
Crystal Sea Marinemix Bio-Assay....340..........9............1050
Instant Ocean............................350.........12............1070
Kent.........................................540.........11............1200
Marine Environment.....................480.........7.5...........1450
Oceanic....................................580..........8.5 ..........1650
OceanPure.................................510..........10...........1320
Red Sea....................................400...........8............1300
Red Sea Coral Pro.......................490...........7............1300
Reef Crystals.............................420..........12...........1260
SeaChem Marine Salt...................500.........10............1400
SeaChem Reef Salt......................540.........10...........1450
Tropic Marin...............................370.........10...........1230
Tropic Marin Pro Reef...................450.........8.5..........1380
Tunze Reef Salt..........................420.........9.5...........1350