That does seem like a nice little penny to pay since you already said you have an IDS in place. Id consider a few things before wanting to replace my existing IDS network.
1. what can this device do that my existing IDS network cant do?
What kind of IDS network device are you running? I havent had much experience with IDS devices besides Cisco's models.
2. What other charges will incure with this device? Im sure they will end up charging a contract to keep the device up to date. Looking at their support page, you need a contract for 24x7 support. Id also find out what this cost, since if you dont have a contract all you get is 8-5 M-F telephone and email support. Also how good is their support, in the event of a hardware failure. Will they ship you a new device no questions asked? How long does the replacement take to get there.


My initial thought would be keep the IDS network you currently have, update the signatures, and maybe look at host IDS's.