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I can jump in here and offer a perspective. Please note this is only my limited experience.
When I built my 8" travel dob I was lucky to be able to purchase some 4552-50 laminate for both alt and az axes. It worked perfectly fine. When I decided to redesign the alt mechanism to better accommodate DSCs, I decided to get some laminate from Alex, which as it turned out was the 4552-90. A comparison showed that it was a very different texture but I thought that's fine I will give it a go. The good news is it works fine and maybe gives a slightly smoother feel to that movement, but that may also be due to a better built alt system.
So, IMHO, the 4552-90 seems to be perfectly OK for smaller scopes. Obviously I haven't used it on a larger beast, so cannot offer an opinion on that, but for what it is worth, that is what I have found.
Cheers
Malcolm
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