Congrats on your new 21RBS! We hope you enjoy it as much as we do ours.
We found the tv to be on the small side, but have not bothered to get a larger one since it has a very good resolution. It also works on 12V which can come in handy when you are boon docking.
We had to change the swing arm bracket though, because it was not engineered well enough to keep the tv level when swung out. We bought a better bracket for it for about $100. Works really well and will hold a level
tv even it is larger. (about 24")