I've ridden in these pants about 8 times now, and I absolutely love them. The slim fit rocks, there's still enough room to get low without the butt riding down. Jacket to pants interface is genius-I have the Burton Lush jacket to zip into. I'm 5'10" 145#, got the size 7 and although a belt is a must, the pants are an all-around great fit. Length was perfect for me. I have the white polka dot ones, and they're pretty much the cutest pants on the planet!
I don't know about the "adjustable tabs" feature...mine don't have that.