Mine (arrived just under 2'9) gained over 2 ounces in a year, stored in the same conditions as all my other bats which barely change weight, if at all. It felt a little dumpy in the hands after the weight gain.
To combat this I removed the toe guard and the very thick scuff sheet, as well as fiddling with the grip setup to get it just below 2'10 and a great feel/pickup once again just as it was when it arrived.
Be aware that the handles are spaghetti thin on the ones i've seen. I have two grips and it still feels pretty thin.
Performance wise definitely one of the top 3 best bats i've ever owned. Finishing as good as there is, no problems with customs or communication. Wouldn't buy again as it's basically the only cricket bat i ever wanted that i can't get at trade price. If this wasn't a factor i wouldn't hesitate to buy again, but would want to know their thoughts on the weight gain.