I have driftwood in my tank that was not intended for aquariums, at least no fish ones. I believe they were for reptiles. I have had them in my tanks for 3 some years without any problems. The wood gets weaker over time (i have broke off one piece at a thin part) a lot quicker than the traditional driftwood, it is also a lot thinner. It has not tainted the water, or grown a fungus, but that is no reason yours couldn't. you just have to watch it I do not have mine in an aquarium with a pleco either, its with a jack demspey that likes to move it around (maybe another reason the piece broke off.)
If you like the wood, keep it. Just keep en eye on it.