Well, the BK drums did pretty well in our drum track shoot out, particularly at the price point those BK3 and BK5 units come in at.
Overall, unless you are already dead set against Roland no matter what, it might well be worth waiting until the demos come out...
For a sub-$1000 unit, I am pretty impressed with the sound of my BK-7m. It compares quite favorably with my G70 (which was $2500 more expensive!) at many things. Sure, the BK3/5/9 aren't built as well as the G70, but sheesh! They sound pretty damn good for the price point (BK9 opinion to come!).
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An arranger is just a tool. What matters is what you build with it..!