The 210 is a great lens, often now overlooked with all the LS glass from Phase One, but if you find a good one, it's tack sharp. The contrast is not on the scale of the modern Phase lenses, but that can be fixed in post.
The 210 is light weight, and small compared to the 75-140 or LS 240. I would also say that the 210 can produce images as sharp as the 240 LS, with the correct technique. It's an excellent travel lens also. The only issue, the hood is integrated and over time it will loose it locking, so the hood just floats around when not in use. When in use you can still lock it, but it's designed to fit back around the lens and lock again, that part is what tends to give way.
I purchased one used from Jack, (one of the owners of this site) and it still works great today, with both the 160/260 and IQ100.
Paul C