IPS Reliability/Availability

[geek_brigades () yahoo com]

I am working on a big IPS project and I am very concerned about installing an inline device in a core enterprise 
network, where these devices have the potential to create big time network outages. 

Can you, please, share your possible bad experiences about the reliability of the following inline IPS products:

ISS
TippingPoint
Juniper IPS
Sourcefire
McAfee IntruShield

Have you had any issues with the availability of these devices, such as fail close crashes or do you have any 
experience with bypass switches that would mitigate the availability issue?

Thanks,
Mike

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