I too have used the Ergo-Rest for articulating arm supports. Couldn't have done my job without it.
I just recently pulled them off my desk again. You have to do that every once in a while to see where you're at. This makes about the 5th time. I'll go as long as I can, longer each time, but usually will put the left one back and then a little later, the right one. it's normal to do this. I've learned you do have to wean yourself off of any aid you're used to.
I'm glad I found them but they're aggravating too.
Nothing works like the REAL THING, BABY!!!!
I also use a long dressing mirror at the side of my workstation as a POSTURE POLICE ! ! ! !