I've owned 3 balls from Global and all three have cracked. Their new line up gets good reviews, but I just can't bring myself to purchase another. The first was replaced (~30 games), but they wouldn't replace the replacement (~15 games) since it was no longer available but did offer me a discount on something still available. I chose not to take them up on the offer. If I drilled my own stuff I probably would have, but didn't feel like risking another $60 for drilling. When the third cracked (just out of warranty, didn't contact them for the above reason) I just gave on them personally. Their customer service seems solid and plenty of other people haven't had problems, but just can't justify trying them again anytime soon.
Kidlost - what "bowler neglect" would lead to cracking? I've heard of too much glue on the inserts, dull bits or drilling too fast/hot, but am not aware of bowler neglect causing cracking. Balls that are never cleaned or de-oiled might lose a lot of performance, but I've never heard of neglect causing cracking.