[Not Compatible] Quality Product

[Rectangular] Hang them vertically or horizontally. Either way, they are great for adding more pars to your existing set up. They are not built to hold a moving head, even a small 10 or 25 watt one. They are however great for adding more pars to really make a wash of light cover the entire area!

[1.41 lb] Great stands for a fraction of the price. These are as advertised. I chose these over the Sonos brand, because the price of Sonos was ridiculous.

[Rectangular] Smartly designed and well built

[5/8" Receiver] These arms do exactly what they're supposed to do. They are lightweight and easily attached. The hardware (set screws) seem somewhat fragile and don't seen to be as durable as they could be; be careful not to damage or over tighten them. Also do not go over the recommend weight limits. These are best used as left-right pairs on a stand-alone lighting or speaker stand. I learned the hard way that they tend to tip over if not counter balanced. If they are attached to a stand with a speaker, the tipping problem is less likely. These arms are priced fairly, lightweight, and easily transported.

[Not Compatible] I own seven tabletop mic stands from various manufacturers. This one is superior to all the others -- much more stable, the clutch mechanism works well (unlike some), it's just a high quality piece -- which is what I was looking for, to hold a $1200 microphone. More expensive than the others, but worth every penny.

[1.41 lb] This pole is great and easy to setup! The adjustable feet can help in some situations but it's always best to find the flattest place you can find. I have already used it for a wedding with no issues and they come with bags! Although mine was a little but torn already at the bottom of the plate bag but not the end of the world.

[5/8" Receiver] works as advertised, good quality.

[5/8" Receiver] Very stable and lightweight.

[Not Compatible] I ordered 3 of these stands for Kid's check-in station for church. Mount it also sells a printer tray that is perfect for the label printer needed for kid's check in. I did a web search for anything like this (both an Ipad holder and a printer tray in a slim design) and this was the only one I found. One note is that the stands can be drilled to the floor for stability, but I didn't want to do that. They could be more stable. I may drill an eyelet into the wall and stabilize them against the wall with fishing wire instead of drilling the stand into the concrete floor.