I purchased a pair of the Sanus Adjustable Speaker Stands_Sonos One/Play 1/Play 3_to mount a pair of Sonos One's. In the past I'd always gone with Flexson but I decided to give the Sanus brand a go.
They are well constructed with a weighted base. The adjustable rod is aluminum and the base is covered in a PVC plastic.
The cable channel is a tuck n' conceal in the rear of the grooved adjustable rod versus the total conceal pass through of the Flexson brand. There are 3 mounts included_one for each type of Sonos speaker. The Play 1 and Play 3 actually screw into their custom support bracket.
The Sonos One sits on a custom piece that slides into the cavity around the power cord where it attaches to the Sonos One base and is held by light padded friction. If you lift the Sonos One it will detach from the support bracket however the tension caused by the cable tuck and friction on the support base prevent the Sonos One from being dislodged by a simple bump.
Overall I'm quite pleased with the mounting system and the aesthetics of the stand. The height adjust-ability is top notch and held in place by a removable plastic trigger. I wouldn't recommend a constant adjusting of the stand (up/down) as they are meant to be a "set it and forget it". I'd imagine the Flexson's are the same in that respect. I saved about $30-USD versus the Flexson brand and have no regrets. I Hope this proves top be of value to someone.