Synopsis: Need a .Net cache solution in which the cache can be
synchronized across multiple hosts on our server farm.

My company is investigating caching as a means to improve performance,
by reducing the database as a bottleneck. However due to constraints
imposed by our integration with business partners, we need a solution
that does not have a single point of failure. In a nutshell:

So far we have found a few vendors that offer solutions:
   GemStone's Gemfire
   Alachisoft's NCache
   Tangosol's Coherence
   ScaleOut's StateServer
   Gigaspaces XAP
However we cannot find reliable (i.e. not PR driven) performance
metrics and/or comparisons for these technologies. Does anyone have
experience with any of these products, or know of alternative
products, or means of achieving our goal?

Thank you,
Adigun Palmer