ZeeKayI've never owned the Ergotron LX so be skeptical about what I say.
In my opinion, the freedom arms were designed much better aesthetically. Everything has a nice slick roundness to it vs the boxy look of the LX. Having said that, the LX looks pretty industrial in terms of build quality while these feel very prosumer to me, just a step below but still exceptional. Lastly, the LX actually looks like it has cable management that is easier to work with. The Freedom arms have pretty bad cable management that you might have to work with a little bit to get the mobility/cleanliness you want.
THVRSDAYI think you're accurate in your observations, from what I can tell I think the LX might have more height adjustment than the Freedom.
I still might get one of these for the wife though.
ZeeKayYes actually, I forgot to mention that you can buy an LX model that has a taller pole and thus more height to work with, I saw that on Ergotron's site yesterday. I haven't seen a taller pole option for these.