What do you like best?
More functions than I can use but fairly simple to maintain,manage and monitor external traffic. We also use the Intrusion Prevention module. Both provide very granular configuration. We did get a 3rd party partner to do the initial install which I recommend.
We have blocked many threats and had were able to verify our internal data assets were safe.
What do you dislike?
Not really a dislike but it is a complicated system which makes sense for the amount of control provided over internet traffic monitoring and filtering.
Unless you know the system well, I strongly recommend help with the initial install as incorrect settings can either shut you down or leave you open to threats.
Recommendations to others considering the product
Cisco is not the cheapest solution but is a solid vendor with a long history in this area. They have a broad range of network products and can work with you for a solution to issues 24/7.
Definitely a case of getting what you pay for with this product. It is rock solid and secure
What business problems are you solving with the product? What benefits have you realized?
Foremost securing our internal systems from outside threats is the primary reason for the firewall. Cisco is well established so we have a resource for support and know they will be around for the long run. Having Cisco network equipment internally helps with one platform/vendor for support.
We are able to protect our data and know of attacks. Monitoring also gives us the ability to look for other issues with traffic. We use Cisco Anyconnect VPN which integrates easily with the ASA5525