Where to start. The TZ170 has a lot of advanced features, including Layer7 Application filtering, Content Filtering, Anti-Spam, Anti-Virus (some will cost you extra). Plus its performance is far superior to the Cisco box. The Cisco 831 is like some sort of firewall from 5 years ago, its security capabilities are ok for the 90s. The VPN setup is also kind of nasty, breaks easy and performance is crap.
However, if $$$ is important you may well want to check out the new TZ150, I understand there will be 10 node and 25 node versions. Its a little cut back from the TZ170 but still has loads more functionality and better secuirty than the Cisco box.
I own the TZ150 and it is awesome. There are a couple minor bugs tho in the UI of the management, for reports, but it's awesome and works great no issues otherwise. It has by far in my opinion the best/most features for the lowest cost.
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sells it for $290 or $534 for the firewall appliance and all the security gatewway suite which has the virus, content filtering and support and even the IPS which is awesome i think. the UI is sooo easy to use and laid out extremly well. It's one heck of a device and features.
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