Great upper end product IMO. It is pricey compared to wood, but that is totally insignificant, since you are only talking about one window. Agree with the others, that long lengths tend to be annoying to work with because they are so flexible. We install with 15 ga Hitachi gun, be sure to use stainless nails. Anything that could get knocked (like window sills) get backed up with ss trim head screws. IMO Azeck and Kleer are the two best brands, because they are more consistently solid in the core and leave a much more workable edge when cut or profiled, the others tend to be much rougher to me. Also, some of the less expensive products have a very brittle outer shell and seem to crack or shatter a lot when nailed. Like everything, you get what you pay for. Although we caulk with high performance selants like Lexal or Geoseal, we find that using it to fill nail holes is too messy. Since our applications are always painted, our painters use exterior grade of painters puttty. Everyting then gets primed with a xylene based primer, and topcoated with top of the line acrylic. I love the product, but for it to look convincing as a wood substitute, it has to be painted for me.