Pros
The working environment is fantastic, everyone here is very friendly and willing to share their knowledge with a smile. The company offers many training classes you can sign up for. The dress code is very relaxed, just dress like an adult. Markit expects a lot of work out of you and you will work long hours but Markit takes really good care of their employees.
Cons
The largest complaint I had, yes I am using past tense as it has been fixed, is that Markit is a global company and my manager was over sea's. This caused many issues.