Picking a SIEM: How's envision compared with Arcsight?

[xxuuyyong () gmail com]

We are looking for a new SIEM for a very large enterprise environment.
  
ArcSight's sales people are always like you must be idiots if you are not using our product.  But my concern is that 
they got acquired by HP, and our past experience dealing with HP's customer support hasn't been very pleasant.  There 
are also rumors that ArcSight has been losing its talents after acquired by HP.

I also looked at QRadar and it's a wonderful product.  However, it's acquired by IBM.  Is it a good idea to invest a 
lot of money and effort on a product that's bound to be discontinued and unsupported in a short couple of years in 
order to be replaced by a re-branded product?

Then there's the RSA envision.  It's been under RSA's product line-up for many years and EMC got it integrated with its 
archer and netwitness products.  This makes it a more stable pick to me.  Can anyone comment on the performance, 
support, and the maintenance complexity of the envision compared to the ArcSight?  

TIA

Ian

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