I've been using AFR for a couple weeks and really like it. Granted I dose a 20 gallon Waterbox Cube without high demand at the moment.
But I feel like a public service announcement needs to be made. Looking at now page three of questions on what it is, how it works, how to dose, and how it compares with two part, I think it needs to be said you really need to understand two part dosing before jumping in with AFR or Carbo-Calcium. All For Reef is maintenance dosing, not for individual point adjustments to Alk, Ca, Mg.
If you've mastered two part dosing (or three when you add in mag) then switching to AFR or Carbo-Calcium should be no big deal. You already know how to accurately measure and gauge the uptake of your tank. You understand why you run the DKH level you do, how nutrients play a role in the proper Alk to CA to MG ratios, and decided on a salt mix that matches your target parameters.
I could be crazy here, too. I'm sure some people are thinking "Hey I'll buy All For Reef and magic will happen." It's a bit more than that, and it's not complicated.
1. Get your Alk, Ca, and Mg stable at the level you want to run your tank at.
2. Dose AFR once a day, twice if you understand all this and the impact of doing so.
3. Make dosing adjustments based on Alk, not calcium, not magnesium.
4. Test your Alk at the same time of day, 24 hours after dosing.
5. If Alk is dropping, increase your dose. If Alk is rising, lower your dose.
6. If Alk dropped or raised dramatically, like near 1 point or more, I suggest not dosing AFR because consumption was not stable to begin with and you need to get back in check before maintenance dosing.
Sorry if anyone takes this as a rant. I'm really trying to help coach you on what I've learned and how I apply AFR to my tank.