Morning from the other side of the pond.
Interesting question and good topics. Glad to see we have a section per release.
Loved Harbinger.
I was a staunch metallist.
From 1980 when I started playing, characters, monsters, scenery you name it I bought it, in metal. Then, from seemingly nowhere comes cheap, pre-painted boxes of goodness. Be still my beating heart.
My wife used to get 'miffed' on the amount I spent on metal figures; now I have to hide the amount I spend on PPM. Hey ho.
So Harbinger (the herald of things to come!!!)
As has been mentioned before, the orcs, drow & human 'sandbags' were extremely useful (and still are).
Some were good to get in (cheapish) plastic - I'm looking at you Shambling mound, Owlbear & elementals.
But what got me excited were the miniatures that hadn't been done in metal (or done badly). Shout outs to Felldrake, Barghest and the Displacer beast.
Finally, I fell in love with some of these figures. It's difficult to explain why one loves something, a bit like describing the smell of the number 12. So I won't bother.
My top 3
3) Didn't have any of these. These allowed me to run the 'Shrine of the Kuo Toa' properly!!!!

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2) A proper, scary Illithid - Wahay!!!!

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1) Yup, I know. Badly painted, just a lump of plastic, no definition - What can I say, I've dated better but I just fell for this one! Used him time and time again. Still do as 'grunt troops' with the additions of the newer ones.

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And that folks is my twopenneth on the Harbinger front.
Cheers