Visionary and Lanemasters are the 2 companies with the very best reputation for cover longevity. I use Visionary equipment, and can say that after about 10 months, with next to no maintenance, they are as strong as ever. Visionary uses a much thick cover on average than any other company, which I think plays a part in how long these balls last.
I personally have a Lightning Flash which uses the Curelyon coverstock you mentioned. That was an awesome coverstock, and my LF still reacts today like it did when I bought it about 7 or 8 years ago. I would expect the Visionary Ogre covers to last as long as the Storm Curelyon covers.
On the other end of the spectrum, Ebonite covers tend to have a much shorter life expectancy. I don't know if that carries over to the other ball companies that Ebonite owns now though.
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Visionary Test Staff 07-08