I hate to say it, but in my eyes, Global 900 might be becoming the new Ebonite as far as cover inconsistency goes. With Ebonite, it was about performance. Some would hook like gang busters and revive well, some were just never as reactive and once they were done, they were done. With Global, their problem seems to be with cover thickness and cracking. I had one very thin cover (cracked and replaced), have seen a few other thin covers, and have seen many more than average crack The good ones are good, but more bad eggs than I want to take a chance on.
Telling it like it is.