SDC is not a good place to work unless you have no other choice.
Pros
EY brand-name still means something on your resume (until people figure out that SDC is not the same as "real EY" a.k.a. Advisory practice). They provide unrestricted access to Udemy which allows a self-motivated person to learn and develop a lot.
Cons
No real choice in the projects get to do as projects are few and far between so you if you are on the bench, you get whatever comes up that can make you chargeable. Salary is extremely low and not at all competitive with the market, most people that leave SDC see bumps of anywhere from 20-30% for similar roles. The work requires no real skill or effort to accomplish and so you don't really learn any marketable skills other than client interaction and maybe SQL depending on the project. Advisory counterparts on your projects will be performing the exact same work that you are but are paid 20-30% more. Most of the traditional consulting perks (e.g. travel, short and varied projects, choice of projects, engaging work) are missing from SDC.