I've been looking at the newer stackable 4-ball bags from these companies and plan on getting one of them next month. I've read on bowlingballs.com that most of the problems on these bags was that the balls on the bottom compartment tends to roll around and shift to the front, causing the bag to tilt and sometimes fall over. I thought that there's some of strap that holds them together, kind of like in the Track 2-Ball rollers. For those who have the newer rollers have you had this sort of issue?

I'd go for the Storm/Roto 4 ball stack or KR/Brunswick "premium" stack just for the longer warranties. The Columbia/Ebonite/Hammer/Track stackables are basically the same except for the top detachable bag, but I've seen 2 different durability results so far.

A buddy of mine has the Track bag, and has let me borrow if a couple of times since I was interested in getting one for myself. Felt sturdy, and the bowling balls in the bottom section didn't seem to roll forward and make the bag want to tip over when I had it standing up. I imagine that it might happen if the lower section were empty and the top bag were full, but I try that, so I'll never know.

My cousin had the Ebonite Grand Tour bag, and the left wheel came off twice. He never went up or down a sidewalk unless there was an inclined ramp, Never tried to pull it through a tight space or in a position where the wheel would rub of scrape against anything. Loading and unloading took a few minutes because he was careful to lay the bag down and not just drop it. Our shop guy sent for repair parts the 1st time, and the 2nd time he just replaced it outright with the Columbia version since my cousin's bag was barely 3 months old.

The Storm bag is awsome. I have had mine for 7 plus years and pulled it up and down many stairs, The only trouble I had was the locking handle sometimes wouldnt stay locked. My brother has the Brunswick bag which is also a good bag but it takes up a lot more space when packing it into your trunk.
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Todd