SIM solution - Objectives ?

Hi,

We have just started using a leading SIM for monitoring logs. It works well.

The SIM management is outsourced.  We have about 150 servers and 10
security devices.

We have SLAs that if a High alert comes vendor should inform us within
15 minutes , for medium alert it is 30 minutes .....etc.

Are corporates [who have some level of maturity in this space] using
SIM solutions to do real time response or are we using it for weekly
reports and then doing trend analysis ?

Does it make sense to receive High alerts and take a 15 minute
response when a login failure happens on a few servers.?

This question is NOT related to the SIM product capabilities but
process to be followed and what goals we should set to achieve with
SIM