I pretty much agree with Smash. I have a KR 3 ball roller that I almost never use. It's just too damn heavy to lift in and out of the trunk. Other than that, I like it a lot. It's very sturdy.
The only reason for a 3 ball roller is that it's easier to navigate the inline type around at a crowded tournament. I was at the PBA Geico Open this weekend, and all the guys had inline 3's. With the "passing lane" behind the seating area being only a foot and a half or so wide, you wouldn't have been able to get anything else through.
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seadrive
Cogito ergo bowl