Exalytics evaluations (remote hosted)

Has anyone evaluated Exalytics, specifically remoted hosted via Oracle or a partner (cloud)?

--Willing to share your thoughts or your experience in baselining performance improvement?

--When does it make sense from a cost/bennefit perspective?

--How would exalytics make an aggregation faster on a BSO cube since it's typically I/O bound? I mean I could understand retrievals and ASO would perform well all loaded up in RAM, but if you have a 3 hour calc all (aggregation) once a month, how much improvement would we see from an Exalytics machine for a 30 GB (15 .pag file BSO cube)? Would that improvement be worth the cost? Would we be able to build a mega-BSO cube on Exalytics in contrast to our current restriction on the breadth and depth of dimensions/members on BSO in a typical server environment (the calc time would take forever on a regular server)? I'm talking BSO-only, our ASO stuff is fast and fine - again not sure how Exalytics improves on ASO to the extent that it pays for itself.

--Looking at Rittman Mead's diagram, it looks like you build your stuff on-site, the replicate it to Exalytics on their site. It's like they're saying "Why have one server, when you can have two servers for the price of three!" I don't get it. http://www.rittmanmead.com/exalytics/oracle-exalytics-in-the-cloud/
 
-I heard Planning won't be included on Exalytics. Planning is the thing that keeps crashing due to large forms. Having Planning on Exalytics would definitely be more worthwhile than Essbase.