Can be great or terrible, depending on your department.
Pros
Fancy office buildings, free soda/coffee, several family and social events each year. Tyler has no real competition for local government software, so they are growing a lot. As soon as a viable competitor comes out though, they will lose a lot of market share.
Cons
Very few managers are trained in management, so some are naturally great, but a lot are terrible. Support teams and QA teams are paid very little. HR is not helpful at all, and often times hypocritical. Raises almost never exceed 2% per year. Executives are literally closed off in a separate part of the building, away from employees and are unapproachable. Tyler also sometimes fires long-standing employees with no explanation, causing a lot of fear. Very few promotion opportunities.