One liquid for all your dosing needs! Sounds like a dream.. If US$116 can solve 1 year of the dosing requirement for my tank I would consider it. However, looks like there's no Canadian vendor selling this product.I use the powder carbo-calcium for a balance of calcium and alkalinity. So no need to test calcium. I have verified few times and the calcium is at 420~440. Just add magnesium manually.
https://aquarium.bulkreefsupply.com/search?w=tropic marin carbo&asug=
The All-for-Reef one will be double the cost, even using the DIY kit.