I love this stuff! Honestly I use these two only for all my tanks, even the larger ones. I started using these two years ago and haven't had any issues with any of my tanks. Everything you need is in the two bottles, however I do not dose daily on any of my tanks. Unless you are having specific issues I dose every other or every 3 days.
I like it since it is all premeasured and it simplifies the guess work for your tank. and as you mentioned, the number of bottles laying around are cut down.
As with everything, you still want to test your water to ensure your corals are not using up more than you are adding. I personally have not had any water quality issues just using A&B.