The main thing the FVS318 has going for it, in what is fast becoming a commodity market segment, is the fact that it's an 8 port product, at a price the other guys charge you for 4. VPN performance is par for a product that doesn't have an IPsec co-processor, and will be ok if your VPN traffic isn't too heavy. But if you need to move lots of big files securely back and forth, you probably won't be happy.
But what I'd really like to see is a version of this baby with the admin interface fixed, sporting an IPsec co-processor, and priced to sell! Now that would make the market share battle much more interesting!