Cisco is pushing the ASA5520 on us to replace the IDS4250 device we currently have. Other than the version upgrade (which I think could be done on the 4250) I don't see the benefit for us. We don't need to utilize the other functions provided by the ASA (PIX, VPN, etc..), only the IDS. I repeat, we have no need to use the other stuff. Placing it inline with our current failover bundle of PIXen doesn't give me a warm and fuzzy since I'm not sure if there is anything built into the ASA to prevent single point of failure. Additionally, we use fiber from core to PIX, the ASA we have is copper only. They are having a hard time figuring out the ASA on a 'stick' configuration... I'm left thinking this is a device for smaller organizations who need all the functionality in one. Not a good option for IDS/IPS only???