The IDSM-2 isn't really that different from any of the other Cisco IDS/IPS platforms. They all run the same system software and management clients, and generally have a standard set of features. As for the comments you've gotten (difficult to tune, false alarms, poor built-in reporting) - those issues are not specific to the IDSM-2. If someone has those kinds of complaints, they would have them with any of the Cisco IDS/IPS products.
Are you definitely getting the IDSM-2? Or is your company still in the decision-making process?
BTW - in my opinion, the design/deployment phase is critical in getting the most out of your IDSM-2 - even moreso than with a dedicated appliance or ASA module. You have to be thorough when choosing how to configure it (inline/passive, placement, etc), and ensuring you're going to see the right traffic. Be sure to take the time to do it right.
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