I bought this product and have been happy with it. It's fairly inexpensive, the trees definitely look better to my eyes, and it certainly didn't hurt performance and might have even helped a little.
The place where I especially noticed it was on the ground at a small airport where there are several trees in the immediate area. The trees had a more realistic look, which helped with the immersion as I was taxiing to the active, plus it was a nice touch that a couple of them were in full bloom, just like they should be in Springtime.
Overall, based on the kind of flying I do (GA aircraft away from the big international airports), I would buy it again.
Keith