I have both the single and double brace On-Stage x-stands with the shift adjustment lock under the keyboard support bar. The double is sturdier but heavier and slightly bigger. The locking mechanisms are identical, so I have no fear of the stand collapsing. For me it's simply a matter of weight and convenience. I also use the On-Stage mic boom attachment and it has worked flawlessly for me for about 5 yrs. now. I simply loosen the knob at the support bar, swing it down and retighten; it folds neatly with the braces.