...it is greasy and the durability is average. I use this product on my wife's plastic trim, and it only looks good for a relatively short amount of time.

Plenty of black trim on my Toyota Tacoma. Used properly and this product completely restores the plastic trim back to black. 2 months later and I only need to do a touch up job.
The black trim needs to be properly cleaned before application, the product will "streak" in the beginning, why? Because more product needs to be applied to the surface! Apply full even coats and the streaking will go away.

I actually use the sponges but I bought this to "refill" the package when they dry from use. It blackens trim very well and you barely need to go back and wipe up the excess. I use it all the time.

I use this after cleaning the trim with D103 APC+ or Mothers Heavy Duty Trim Cleaner. I apply 2 coats for even coverage and follow up with a final buff to remove any excess product after about 10-15 min. I have personally tested this and got 1 month out of it. Not the best durability but still very good for an average user.

You can see my more in depth look here
http://www.autopiaforums.com/forums/detailing-product-reviews/43987-review-meguiars-ultimate-black-plastic-restorer.html

For an OTC non boutique product it does a good job, but it does not last very long which really is not great. But it does spread far, and it's not expensive at all. For production work this would be ideal.

For best results you need to clean your plastic trim first. I used Meguiar's APC + and a toothbrush. Then I applied 3 thin coats about 10 minutes apart. After the last coat I wiped it down with a paper towel and it buffed to a dark, smooth finish. It looked very natural.

Even though initially it worked well, (hard to apply on Ford f150 bumpers), it does streak and needs to be applied almost everytime I went through a good car wash. I know it won't stay applied forever, but i did thought I would make it through at least one(1) car wash before it streaked and came off. And this after three applications before the wash. To be truthful, F21 spray works just as well, easier to apply, and costs less. Since it (Meguiar's Ultimate Black) doesn't stay on too well for very long, I would not recommend this to anyone unless you are willing to reapply it every time you get your car washed. But you be the judge, I just call em as I use em! Good Luck!