Pros
I worked my but off to get a job with Sephora right after I graduated school that was my number 1 goal. I owe Sephora so much as they gave me a platform as an artist and had such amazing training. My team at the time was so amazing everyone loved what they did and loved Makeup. If you are starting out in makeup, I strongly suggest working for a company like Sephora for Artistry and to really work with different skins and textures. Plus the insane amount of brands at your fingertips. It's an MUA dream.
Cons
Moving up. It was increasingly hard to move up and get promoted for lack of opportunity. I still know some great artists who have been working there for years and are still in the same position. Work life balance is also a definite con.