Hi incognito,
You can read some of my thoughts about Essentia and some of the misleading claims they make and some forum discussions with them in this thread and this thread and posts #3 and #4 here). Needless to say I would be very cautious here.
OMI makes some high quality mattresses (including organic mattresses) and there are no lower quality materials or weak links in any of them but they are also in a significantly higher budget range compared to other similar mattresses that use the same or very similar materials and components so I would make sure you make some very careful value comparisons to make sure that there is a compelling and clearly identifiable reason that they were clearly “better” in some way that was important to you that would justify the higher prices compared to the many other similar mattresses that are available to you that are in much lower budget ranges…
Phoenix