Pros
F5 Networks is a truly global company with exceptional people. The products are great, particularly so in comparison to any competitive solutions available on the market. Based on what I've seen so far, I expect nothing but strong growth in all product fields in the future. An exceptional CEO Management approval of 97% here on glassdoor is something you also feel internally. Just listen to any John McAdams speech or comment and you'll get why everybody likes him. Cooperation between different company departments is very good. I highly recommend F5 Networks as a great company to work for, offering personal freedom for development and recognizing and rewarding commitment. By the way, people at F5 work hard, but they also know how to party!
Cons
Honestly, nothing really that I could think of. I just have to observe the 20 word minimum of glassdoor.com. Well, I'd like to highlight that everybody at F5 was very welcoming to me as a new employee, but that's just another positive aspect of the company.