I had the tank set up and running for almost 5 months...
During this short time, the only issue i had with it, is it ended up turning a dark brown. Other than that, no leaks, it didnt weaken from what i could feel. When i finally drained it, the rubber was still hardened, and would not peel, or feel like i could rip it off. It also still looked the same in terms of texture, making me feel as though it does not deteriorate or melt away over time. Algae did grow on it, but it came off easily with a gentle wipe with an algae brush.
This was only a 5 month test, but i feel it could last a few years for sure. I ended up selling this tank, to make room for a new, bigger build.