Pros
Beautiful, open workspace in the Canton office with rotating art gallery, greenery indoor and out, and subsidized lunches (not vegan- or health-friendly, unfortunately, but good for most people). As a programmer you'll work on a close-knit team with daily face-to-face interactions with co-programmers, Q&A, and your managers. My team was from diverse backgrounds, all capable, pleasant, and loyal to each other and our software products.
Cons
My experience was circa 2003 so this may be outdated. Highly conservative software products. If innovations in CS drive you, MEDITECH may not be for you. Exceptionally low pay for engineers. My understanding was they hire everyone at entry pay for technical non-programmers, expecting you to do 1-2 years of technical customer assistance before becoming a programmer. When I was hired right into development, I skipped those 2 years of salary growth so I was a developer with literally half the industry average for Boston. Growth is fast but my cube-mate did not hit industry average until his fifth year. I left for salary and don't regret it.