I have been looking into upgrading our spam and web filter devices and in the process came across Barracuda's program called product refresh. Basically, I can get a discounted replacement unit that's the same model as our old ones, but the current generation of hardware. It looks like a good option, since the Web Filter 310 was rated for 5mb throughput when we purchased it and not is rated up to 50mb throughput. There must have been some significant hardware changes in the last 5 years!
We also have the Spam Filter 300 and have major latency issues and are off of instant replacement service.
To me, it looks like a no-brainer to stick with them, so we can just convert our current configurations over to a new unit and keep running business as usual. If anyone has taken advantage of this program, I'd love to hear your experiences. Thanks!