Pros
The benefits are great (good medical, dental, vision, life, corporate discounts at major retailers, etc.); since LabCorp is a large corporation, there is room for movement* (vertical/horizontal) and the ability to transfer, unlike a smaller lab. There's also no chance of the lab being bought out (closed down, possibly, but not bought out).
Cons
*Movement entails you having a good rapport with your supervisors (not necessarily your coworkers) and being relatively squeaky clean on paper. Unfortunately, even if you work hard, there's no guarantee you'll be recognized or that your abilities would merit further training to make you more of an asset to the company. And as some reviewers have written, you will tend to feel like a number and will get frustrated that there have been people working there for years, but have no clue what they are doing. Your pay is also significantly less without a degree, even if you know more of the work and do more of the work than someone with a bachelor's or a license. It's common for lower paid people to do more tasks while those that are higher up in the food chain do less.