Yashinon SUPER DX 135mm f2,8 any good??

The short answer is that we don't know this lens. All I can tell you from the photos is that is a preset lens but the only similar lens listed is the Super Yashinon-R 1.35cm f2.8 and that had a Pentamatic mount. It does not appear on any Yashica lens list that I have although there are a few images on the web.

We'll need to add it to our list - I'll check back on my camera manuals for the early M42 bodies and see if I can find a reference to it; it would be helpful to work out its place in the Yashica lens history if we can find its optical configuration but it may be a limited run of the Pentamatic lens in the new M42 mount prior to the arrival of the dedicated Yashikor lenses.

EDIT

I have been able to find a couple of old manuals from the early 1960s which introduce the DX designation and Yashica makes a point of stating in bold on the cover that these have M42 mounts so we're in the era of the changeover from Pentamatic bayonets.  Your Super Yashinon-DX is a classic 5/4 formula and is identical to the Auto Yashinon DX except that it has the preset mechanism which reduces its weight by 83g to 417g.  If you check out reviews of the Auto Yashinon-DX 135 2.8, you'll know the optical quality of your lens.

In the light of finding the early M42 catalogues and manuals, I have some additional lenses to add to the list which I will do over the coming days.