When I first saw CFE-223 I thought the same thing. It pours like water, so I figured it MUST meter great, right? Well, it doesn't.
In fact my careful metering tests show that CFE-223 doesn't meter as accurately as short stick powder like Vihtavuori N-140 or IMR 8208 XBR. The test results with my Lock-N-Load case activated manual powder dispenser and my RCBS Chargemaster (automatic trickler/scale) are the same; i.e. not as accurate as one might hope when it comes to consistent charge weights.
I have had good accuracy results in my 6mm BR and as a matter of fact the best 5-shot group of .160 was made with CFE-223. But it is not as consistent as IMR 4895, so that's what I use for my competition ammo.
In my .223 using either regular or magnum primers, I get quite a few click/bang type hang fires. Accuracy is OK sometimes, but less consistent than Vihtavuori N-140 so that's what I use for F/TR competition ammo.
I don't find it dirty and I have no copper fouling problems.
Bottom line: It's pretty good, but in my guns other powders are generally more accurate so I don't use CFE-223 for competition. Of course, your results may be different.