Bought my Arc 01 with X315 classic 3 years ago and now I bought the x340 PRO together with Arc stealth. This explain the trust in prism+ products. They are easy to set up and does its job really well!
It was a bit of a fiddle when setting up. But once it's done loving every second of it. Kinda regretted not getting the double stand instead since planning for dual monitor stand set up. Pretty sleek looking main reason why I went for this and its affordability
Build quality is great. Didn't realise it has 2 USB ports. compared to my other 2 arm stand, it is much better and more smooth to rotate and flex.
As the title mention, it really depends on how you arranged and use it. For me, although I have a glass stand for my monitor, I choose to get the monitor arm for flexibility in usage. One example is that I can extend my monitor arm out and bring the monitor closer to my bed to watch movie. Without the default monitor base, I can also place my switch dock on the glass stand.