Pros
Any Pros would only be attributable to the company I worked for before the Alliance purchase.
Cons
I work for a company recently purchased by Alliance and absorbed into their family of companies. Our purchase amounted to a significant (about 20%) cut to my take-home pay due to Alliance's flimsy 'benefits' with no plan to compensate for that loss. We were also moved to Alliance's health insurance, which is not only significantly worse than our previous insurance, the premiums are so expensive that I couldn't afford to go to the doctor even with the meager coverage it provides. They offset this with an HSA credit card that you'll be thrilled to find out at the register covers as little as their insurance does. Their HR is largely unresponsive, raises are essentially non-existent, corporate structure is not transparent, and essentially everyone above me from within Alliance I've worked closely with has been shockingly inept at their job and producing work that doesn't line up with industry standards. God help you if your company gets bought up next.