Again with these stands manufacturers go with standard heights (of people that is).

Max height is 91 cm, which makes it way to low in hand position for someone at 6' in my view.

It does look a good stand (the M91/92) but too low for me.

One thing the Apex, (and the Proel one mentioned above) do, is give good height to the taller player. Although I found the Proel to be a bit too "wobbly" with heavier keyboards.

I would also have my doubts on the m92 side to side stability. Plus the upper tier width is always determined by the width of the lower.

I am about to try the On-Stage KS 7150 with the KSA7500 universal second tier.

It has good height, looks to be rock solid (sorta reminds me of the stage 73 flatop), and the second tier is independent of the bottom section, so you can have it narrower for a laptop, for example without having to add a flat board or similar.

Just my view. Not criticising anyone else's.

Dennis