I have done several ambo builds with the Monsta and overall I like the results. Like Brian just said you CANT be to concerned with absolute perfection. Monsta is great generally but it does like to "set up" rather quickly and you can get the bits of roller in the paint and there seems to be no way of knowing how or when the roller bits will start to break off. Also because it sets up quickly I fell rushed to get it done and the results can diminish. All of mine look great from about 10ft but once you get closer you can see roller marks, runs, chunks etc. But for me i dont really mind. The vehicle is designed to be tough and is going to get scratched and imperfections anyway, so i dont mind some imperfections. I like that it does not scratch easily, hail does not bother it, and it looks rugged. I imagine if you had a large enough garage where you could do it all in a climate controlled environment your results would be better. The ambos are so big they do not fit in the garage so even on a perfect day you will still have some element of wind, and bugs also seem to be attracted to it.
The first three all have monsta on the cabs and fronts of boxes, on the last one the monsta is on the side of the box