Hola KC,
Sorry if I was not clear.
I can't vouch for OZ's testimony, as I don't know what he has experienced. So , no I do not agree with it. I only offered essentially a difference between SOS, Isla(though not mentioned) and Moperc.
That said, my opening statement will bear my thoughts on this. To repeat I do not have any experience of a close look or playing time with Matt's congas, nor the new GB's.
Since we are in the topic of Mopercs, I just wanted to share my thoughts on Mopercs in general. correct me if I am wrong, but the current non mass produced congas in N America are (in no specific order) SOS, Moperc, Matt Smith and I would like to include GB's CA model and perhaps Isla-though Mario has moved,
IMO ahh, but then I forgot about Volcano, doh!! In essense that is my comparison.
So for a comparison I can say that I have had SOS in oak. Currently own Mopercs, Isla, LP Valje, LP classics. I also have in the past owned Tocas, old GB's, Meinl, LP original fiberglass,and played(not owned) old Valje, Juniors for some background info.
Again I cannot speak for OZ, but I understand his opinion since I own Mopercs. I believe Stainless steel is a higher quality steel than chrome coated. Price is a consideration, and most times the price does make a difference. The precision work Michel has on the hardware is only experienced by seeing, holding, playing with one of the drums. Cosmetically,most stainless steel has a brushed appearance (Volcano is another animal

), so it may not be as shiny as chromed steel. But the precision crown, ears, lugs and side plates make a mechanically better bet. Sure its just metal parts pulling on skin, but you can see quality work in a product. In the end it all adds up. Tunning the drum is effortless, and more precise. You know how you crank up a drum , the skin makes a pop sound? Lp's will scare the hell out of you at first

if you never experienced it-I sure you know what I mean. Moperc congas do that(as any conga) but in a more subdued fashion. You can hear the skin ripple , but does not have the steel sounding knock ping.
My honest opinion is that Michel(Moperc) is making congas in a modern sensability of a traditonal design. The difference is hardware quality, shell shape/stave config from Juniors and a crown/skin mounting choke design . If you search some of mussings, I explained the difference of resonance vs the choke.
Moperc has a open choke-modern(open). Olsongos description of rubber head is what makes it choke as the skin is broken in. Matt's appears to be in between traditional and modern-half open. SOS are traditional choked. Old Gb's were choked too , but to the extreme with the bleached skin. Isla gets choked as they break in also.
My current obsession is having choked ride drum along with open lower drums. But I need a better size choked ride drum , so will be getting one made by Jay very soon

Soon after will complete the set of SOS. Best time to get em built is spring or fall, hopefully he will have a good set of cured wood stock on hand.
I wanted to get a cubano quinto ( 11" with 6 lugs) from Michel, but the shipping issues and the change to ash wood only (no more maple boo-hoo)has me concerned to curtail my acquisition .
Hope that helps.
T