Pros
I worked for Navisite for over 4 years, and it was a positive career move. They paid well for my experience level. The teams I worked with were great people. Navisite has been a well known locally based datacenter hosting / cloud services company for decades (with a global footprint, having offices in US, UK and India), and during my time there I got to work on projects for a number of impressive clients. Navisite can be a great place to get a foot in the IT infrastructure door someone looking to advance their career. I had the freedom to manage my own projects, and create test environments for potential new services under my own initiative.
Cons
During my time at Navisite there were 2 mergers, at least 3 rounds of layoffs, and 2 additional rumored/threatened mergers. My team's senior engineer was laid off (we believe they were trying to get rid of remote workers who had no local office to move to) which took the legs out from under us. My manager was laid off the following year which nearly broke the team as he was our advocate where no one else in the organization really understood our team's work. Even between rounds of layoffs there was a constant unease at the feeling that we were training our replacements in India and waiting for the axe to fall. Additionally, our day to day work involved constant putting out of fires and juggling of resources on outdated and aging server / infrastructure hardware which there was no budget to refresh. As a supposed cutting edge cloud host it's embarassing to show customers the 6-7 year old hosts we run in production, and to respond to complaints about performance with "I'll see if we can find any newer hosts to swap into your cluster". The short-sightedness and typical corporate bottom-line focused approach of upper management infected the culture all the way down, to the point where engineers basically throw up their hands and take no ownership. In fact, a strong trend company-wide is CMA and deflect blame, which is poison in any company.