I support a small office (15 users, ActiveDirectory, Windows 2008 and Windows 7). We've been using LogMeIn Hamachi for VPN, to enable our remote users to get to the file shares from home. It's been working fine, as our performance needs are small.
As more users come online, I'm starting to look at other solutions. What should I consider when weighing the cost for something like the SonicWall NSA 2400? What does that extra $2450.00 get us beyond the $50.00 I'm paying for Hamachi? Is an appliance like this overkill for a small office?
Update 1: This is a little different than the question "Hardware firewall vs VMware firewall appliance", which distinguishes between a hardware appliance and a VM-based (but still dedicated) appliance. We're using neither of those currently.
Update 2: The answers to the question "Why buy high end hardware firewalls?" do provide some good reasons, my favorite being "paying to have someone to blame."