BlueArc is hanging onto their IOPS numbers from a 10+ year old benchmark app, they seem to be among few NAS vendors yet to publish SFS 2008 numbers. Probably because they know it will destroy their numbers(as it's destroyed pretty much everyone's numbers due to the big change in workload).
BA has great NAS technology though the HDS AMS line is a pretty poor midrange box, really doesn't offer anything that is interesting. And the USP is just too $$, not worth it unless money is not even a consideration for your org.
Too bad they refuse to hook it up to something a little more capable/cost-effective than what HDS has to offer.