MakeUpForever, Kryolan, RMCA, Cinema Secrets are usually just used by professionals although anyone use them just as you use any cosmetics.
They are usually made with different formulas that leave behind the ingredients that sometimes can make photos go wrong.
Professional formulas usually are more pigmentated and free of sunscreen ingredients that can reflect flashes.
What also happens, is that this formulas, since they are more used by pros then the rest, are sometimes more difficult to use in case you have no experience. Like concealers, most people by concealers that have about 20% pigmentation, so they are more thin and easily spreadable.
A pro concealer has about 60% pigmentation in its formula, so you have to heat it up a bit in your hand so it becomes more easily spreadable.
But if you can work it out, i assure you it will be the best you ever bought!
Also, this formulas are to be fixed with powder in the end, and most people when they are looking for concealers don´t see it as a fundamental part in setting the makeup, like a pro does, so with a regular concealer you can maybe skip this part, but with pro makeup you can´t.
ps- i am mentioning concealers a lot, because they are the most essential makeup product a pro has. They have to be the best you can find and they also double as foundation if mixed with a thiner and you can also correct all facial imperfections with these alone.
