I think it's more about Emissions, reduction of wear on the engine and it just runs a lot quieter I found. Coasting is mostly noticeable when you take your foot off the throttle, but acceleration seems improved too. Reduced wear isn't going to put your engine at risk, that's all regular oil does anyway.
For me, sound is one of the most important things, way more important than BHP, but that's just me. It's the reason I got my exhaust, so I didn't pee people off in the morning when I start my car.
If you are into listening to and heeding professional opinions, Tom at TGM (a race car driver) thinks the standard DC5 has way more power than anyone needs, that's an opinion I agree with, but others wont.
You aren't massively missing anything by not having the oil smoother, but I hated the sound of my engine before but having a carbon bonnet with no sound proofing is my own styling choice but now it's much more bearable, I hardly notice it at all. It's so quiet now and everything feels that little bit more responsive.
Opinions are great, but completely irrelevant if you haven't tried the product yourself.
Beneath all the science, is just a bunch of common sense. You don't have to be a scientist to understand how it works.
What does engine oil do?
http://www.mobil1.co.uk/why-synthetic-oil/what-does-engine-oil-do.aspx?_c=sc8388mppm9wbje5gsz14565uc&_s=errwonu76thuxsffgpce4ky17a
According to Mobil 1, lubricants heavily influence: Performance, Fuel Consumption and Emissions....
These three things are apparent benefits of the oil smoother. The Oil Smoother Molecules apparently increase the bearing effect of engine oil.
They key thing to remember here is that the Oil Smoother Particles are smaller than regular oil particles, so it can go much more easily around the oil particles and into tiny crevices regular oil cant reach, which aids the bearing effect and reduces friction. (I wish I kept my spec sheet! It was in bad engrish, lol, but it detailed everything like this)
As always with new products that claim this and that, there is always skepticism.
IMO and first hand experience, this product does what it claims, even if the benefits are minimal, it still works and will not damage your engine, it is actually quite the opposite, it reduces long term wear on your engine because everything is more lubricated, that's all lubrication basically is, a bunch of microscopic balls reducing friction.