It will probably not hold position well if it's too light.
I don't trust spring ones, either they move too easy or not at all, in which case, what's the point of the spring. Many can lock in place, but again, what's the point of a spring then?
I've had wall mounts (similar), they're nice, but one thing to consider on all of these is the leverage on them. Ever see those clamp on table lamps and how often they have clamp issues, are you sure you want to trust a monitor to something similar, even if made better? Go read the various reviews on them on Amazon, so many problems with them, all of them, falling, not staying in place... Seriously, I spent a LOT of time on this and in the end, none of them sounded that good. If the single arms look bad, it's worse for multi-screens. Seriously, how hard can this be?
After years with my wall mounts, which I was only sort of happy with the entire time, I found a better way, at least for me, once I got a better monitor. Use a monitor shelf. They are more sturdy, cheaper, compatible with any screen, doesn't wear over time or have weird issues and it gets the monitor stand off your desk. I ended up with more desk space and more storage this way than had I gone with an arm. The only trouble is you need a screen with adjustable height or you may have trouble getting the height right.
If you do go for an arm, my advice is don't spend a ton (which is easy to do), don't expect greatness (they all suck in some way), and keep in mind that there is actually only a few options, all made by the same companies so don't buy one because of the name. And above all else, make sure it fits (a rule you are trying to break), because they are such fickle things, and not cheap, you want the one that works, not because it looks nice. Pay attention to the way it mounts to the desk, that and springs (again where you are trying to cheat) is almost always what people complain about.