@edgewear
I have only heard the MSL & Airtight.
My impression is the MSL tends to sound more precise versus the Airthight which is little warmer in the midrange. Personally whilst others describe the Air Tights as more musical, romantic - I found them to be a little muddled through the midband. Of those two brands I would go Mysonic every time. I think some folk who have "hifi systems" prefer added warmth to flesh out what is missing from their system.
I think what happens is that as Matsudaira's development continues you get trickle down to the OEMs. I suspect that the OEM's have a say in how their versions are voiced. You have to remember that all of these businesses - Mysonic, Air Tight, Techdas etc - are artisanal and they will be wanting a voicing that suits their own products that they either manufacture or distribute.
At each price point they are similar in performance, but my attitude is why buy the OEM when you can buy the original. The designers own brand, Mysonic, will represent best the designers goals at each price point in my view.