You won't be disappointed. The only problem I had with it was that it would not bond to the super smooth plastic on my side mirror housings. That could have been because I had previously used Back to Black on them, though. It stayed on everything else very good, though.
I removed my trim, washed and dried it thoroughly, and then applied three coats of the dye. You can do more or fewer coatings depending on how dark you want the trim to be. Mine was pretty faded, so it took three. Also, it's advertised on their website that you can use it without removing the trim from the car or even using masking tape. I would not recommend this. You really need to remove the trim.
Anywho, I need to dye my outside door handles when the weather gets nice. Funny that Griots used a black E36 as their demo car in the tutorial video. :rofl: They're only about 40 minutes away from me (and their showroom is awesome), but I swear it wasn't my car.