Pros
Garmin has beautiful headquarters with a garden, cafeteria with numerous food options every day, a huge gym, indoor courts for basketball/pickleball, etc, and outdoor walking areas. They hold a lot of fun events for employees throughout the year. There are many clubs to get involved in, and a lot of people who are motivated and love working there to get along with. They take great care of their employees. My bosses were always open to feedback and improvements and actually listened.
Cons
The only cons are that Garmin is unfortunately going for the "corporate" look and feel. They used to have a more fun and colorful environment, but they started "renovating" everything to literally be gray. They introduced cubicles that are "modern" and gray and bland and painted the walls gray or white. We used to work in cool offices but got moved to these cramped, bland cubicles with like one window in the entire space and fluorescent lights. So the work environment itself became very depressing and corporate. Also, Garmin does pay on the lower end of the average range for positions, but their benefits are good so I guess that makes up for it. Just don't expect to be taking home a huge paycheck relative to your position.