I've owned every RBL except the twelve gauge. My rule of thumb with them is: "The smaller the gauge, the better the gun."
The only two I've kept are a 20 gauge with I like very much and a 28 gauge which I love.
The two 16 gauge guns I owned were beastly...overweight and bulky. That's quite a combination. The few 12 gauge guns I've handled have had the same problems.