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Hi,
First up, I must say I am no expert in this area. However, I have had some exposure to mirror refurbishing issues and I hope the following comments may be of some assistance.
Hopefully Satchmo might hop in with some expert advice on mirror coatings.
While you have specificaly mentioned Obsession, I guess the core of your question relates to the practicality of the various "enhanced" coatings vs the more basic Al and protected Al.
In the past there has been some discussion on the web re the longevity of enhanced vs standard coatings. By longevity, I am refering to the ability of the coating to retain its specified reflectivity level over time. My limited understanding is that enhanced coatings tend to loose their higher reflectivity levels over time and in the longer term you end up with similar levels to basic protected Al.
Bearing in mind (as far as I am aware) there is no facility available in this country for renewing such coatings, you might might want to look at the balance between coating longevity vs benefit vs cost vs local recoating capability.
In addition I understand some types of "enhanced" coatings cannot be stripped in the standard manner using an etching liquid and the only way to remove the old coating is to re-polish the mirror.
Cheers,
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