A lot of people like the bud candy, the bud factor x was pulled from shelves for having a non labeled pesticide along with a lot of their products for mislabeling. its now labeled and contains basically an acne medicine to initiate a SAR response. All of these products can be found for less made by other manufacturers or made at home.
Basically all additives should have something beneficial to plant growth in some way. Advanced just finds a way to separate and charge more for it.
If you want solid advice, don't waste your money, there are plenty of well known members here with grow journals to prove, ask them questions and try and figure out what additives work best, if you must use advanced just compare them to ingredients on advanced labels and buy the advanced version of whatever you like.
When asking questions about them you're going to get a lot of negative feedback but the info is here. Read read read and you will see what works best.
I'm using advanced grow micro bloom in my next grow cause it was free, I'll be using rhino skin, tarantula, big bud, nirvana, b52, bud candy/factor x, piranha, overdrive and sensizyme. It was all free so I'm checking it out. I will probably end up using a GH lineup or DG lineup in the end because of what I've seen on here.