Tamron/Vivitar/"Generic" 135mm f/2.8

General
There's many brands for this design, the 135mm f/2.8, and most are pretty much the same thing. Perhaps the Tamron and the Vivitar might have a hint of a better build quality - but that is only a speculation. Optically, they're mostly the same.

Pros/Cons
+ fast prime tele for peanuts
+ reasonably good image quality
+ if it has lasted 30+ years, it might as well last another 30; simple, not much sophistication (=not prone to break down)

- manual focus + 135mm + f/2.8 = major pain
- ultimately, what's the point. Sure, it's cheap. But it's also kinda useless
- heavy

Taken with a Porst 135mm f/2.8

Intended Users
Great for:

• portraits of subjects that can stay still
• artistic, "I-don't-care-how-it-turns-out" kind of photos
• looks good on the shelf

Not for:

• people looking for a lens to take snapshot photos with
• anything that moves
• any situation that you can't take more than 5 similar shots (with lenses like these, 70% of the photos are out of focus)

Final Verdict
Cheap, fast, reasonably good, but the lack of AF is a deal breaker. You will get frustrated, so spare yourself. Getting a Nikkor 50mm f/1.8G AF-Sor a Nikkor AF-S VR 55-200mm(depending on your needs) is a far better value