I have a single Proline Stand. It gets the job done. The Pen broke off from the lace that was holding it and I lost that. I only use the pro line for a single battery powered speaker during ceremonies OR to hold some lighting effects on. It's a sturdy stand. The On Stage stands are more hallow and aluminum, but I love that they are light weight and those stands have stood the test of time for me. I like the Rockville stands too but after 5 years they are starting to look rough. I need to touch them up with a sharpie marker or black paint.
It has been over 20 years that I bought some of my stands & the stands have gotten use. Lights & speakers.