Aeris, Oceanic, and Hollis are all owned by the same company. Aeris is the 'value' brand (I think), Oceanic is the 'normal' brand and Hollis is the 'technical' brand. Most of the Hollis regulators are similar to their Oceanic counterparts. If you catch a sale on them they cannot be beat for the price.
I read the regulator forum regularly and I only remember one post on the SR-2. I remember the person liked the regulator but I don't remember if he dove it or if it was first impressions. Also don't put too much stock in reviews. As you mentioned, Sherwood screwed the pooch with the SR-1 but from what I remember it received rave reviews.
It is your money and you can spend it anyway you please but you have a top-of-the-line Apeks regulator, you do not need to upgrade as you will not find anything much better. I hope the shop owner is getting you a keyman discount or at least selling it too you at cost because he should not be making money selling items to employees.