Training on NAS solutions requires very specific information on each product that can only be given by the vendors' themselves. If you are looking for competitive information about products, with comparison matrices, that's a different issue.
You're correct that the landscape changes quickly and it's difficult to keep up which is why most customers typically only investigate at the time they are considering a purchase. The competitive information is usually a chargeable service done by very few industry analysts and it's justified since they have to keep all the information up-to-date and do the research to produce the comparison matrices. The Evaluator Group is one company that does that as do a few others I'm sure. Some consultants would do that for you on a contract basis as well, whether a one-time evaluation or an ongoing status for a fee. It doesn't look like there's anything worthwhile that is free.
Evaluator Group, Inc.
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This was first published in November 2002