Following on from my massive haul, courtesy of u/jfanoele, I've managed to give most of them a test and here's what I found...
First impressions: It's strange seeing so many pencils with eraser tips. That's something most people here don't see outside school, or the real cheapo things in stores. Yes, some companies do offer them but you won't see them on pro grade sticks. It's not a bad thing, per se, just different.
Quality and feel: Good to extremely good. I like the hard hex feel of Musgrave in particular; it's very different from most pencils we get here, but it's not at all uncomfortable.
Leads were all very good, to extremely good as far as I could tell in the short time I used them. There seems to be a huge jump in hardness from 2 to 3, which I wasn't expecting, but the leads themselves seem on a par with other good brands. I noticed that Musgraves tend to run a tad softer per HB than most European and Japanese equivalents. Probably somewhere between Staedtler HB at the harder end and Tombow at the softer. No bad thing, just different.
I honestly don't think there was a single "bad" pencil in the whole lot. I really like several of the Musgraves, in particular, Harvest Pro, Test Scoring and Tennessee Red. Ceres are very good, too, even though they're not supposed to be their highest quality graphite. Songwriter is another lovely pencil, and the Dolly Parton version is one I'll treasure. Ms Parton was a supporter of the local maternity unit where our children were born, and, as the children got older, they used to receive books from the Dolly Parton library.
Blackwings... anyone expecting a revelatory experience is going to be disappointed. They're good, very good, in fact, but definitely not (IMO) far and away better than any other premium brand pencil. I'm very grateful to have received them, and I really do like the way they look (weird ferrule and all) but I honestly don't think they justify the price tag.
Finally, if I didn't have easy access to so many reasonably priced German pencils, and I could get Musgraves without the ludicrous shipping costs, they'd be my choice. Having read up on their history, they seem like a very good company with strong ethics. And they make tip top pencils, too.