Hi, Rusty!
Well, I only got my Collins mid morning yesterday, so have not had all that much time yet to "browse" through it.
But I very much like its clear format.
For instance , I looked up "land"...... the various meanings, and other words beginning with such, are set out much more clearly than they are in my Chambers.
Each word beginning a fresh line......
It is much easier to see different definitions and derivatives.
And I like its listing Proper Nouns.
I have checked several Proper Nouns in both dictionaries, but am only finding them in the Collins.
But I have only touched on the surface yet, only having owned the Collins dictionary for one day!
However, the Collins does not have "taghairm"!
Mind you , this word is not in my ill-fated 13th edition of Chambers, either (altho it is in your 12th!)
"Taghairm" is one of the listed "Missing words" from the 13th Chambers.....
The additional supplement later supplied gives it as "inspiration sought by lying in a bullock's hide behind a waterfall"
Just as we, of course, know it......
Now the Online Collins ( a newer version than our book ) has it , but simply gives it as "Scottish :
a form of divination once practised in the Highlands of Scotland "
No mention of "bullocks"...nor of "waterfall"!!!
But where would we be without a bullock hide...?