I've been operating in this configuration for 6 months in two locations without a problem. The version upgrade went very nicely as well because I could fail over to the 2nd firewall, do the upgrade and reboot without taking down the network. We are running on Dell 1750's w/ 2Gb ram, dual proc, dual power supplies and 4 NIC's per server (1 wan, 1 lan, 1 sync, 1 future 2nd ISP). Probably the cheapest and most robust solution on the market.
Curtis
