Re: weighs 45 pounds
Depends on the monitor. I still have two 21" CRTs, and yes, they're a faff to move around although doable by yourself. Re-arranging the study recently was annoying. I still like them, regardless.
However my main TFT (HP, 1600x1200) is not exactly light either. You can hold it in one hand, but only just. A lot of weight is probably in the stand.
When one of the CRTs die, I'm probably going 1440p rather than 4K, but we'll see.