The Java Gel appears to be just one of many colors of oil based gel stain manufactured by General Finishes. I have used their gel stains before, but only the water based. Since I work mostly with pine for my projects and Baltic Birch for portraits, gel stains produce a much better appearance. If you are going to try it, I would suggest also picking up some pre-stain would conditioner from them as well. The conditioner will help keep the wood from staining splotchy due to different grain density in the wood. I haven't tried it on BB ply, so test it on scrap first. Good luck and let us know if it works for you.
Barry