I haven't tried Alpacas but have tried C3 Tangerine R2 and Mauves.
1. H1 from the two videos sounds very similar to how Mauves sound. Slightly sharper but that's could easily be attributed to other build factors as well as the microphone. C3 Tangerine R2 sound is closer to Inks and Tealios than these new crop of silky-thocks from JWK.
2. Mauve rattles and filming does not help. What reduced rattle in my Mauve build is lubing, adjusting reducing spring weight, and trying different keycaps and profiles. AFAIK, the sound is made by the top surface of the slider hitting the top housing which is why reducing spring weight or adding more lube there reduces rattle. But it's not clear whether stronger spring, like H1's 78g, will help or hurt with the rattle.
3. IMO these silky-thocks (Alpaca, Mauve, Marshmallow, and now H1) from JWK are the best value linear switches today. The good news is that we've now reached the level of smoothness where what I can best describe as
skating feel surfaces prominently. The bad news is that we now have to choose between skating and buttery feel as they don't mix well (lube adds drag that detracts from skating).
UPDATE:
4. I was able to swap top housing easily with Mauves. C3 Tangerine R2 top fits. Aliaz top fits. etc. I think they all use the same housing design and process, changing only the material and coloring. FYI, nyton top had slightly more rattle than polycarb top.
5. I'd like to see JWK make some
silky-clacks by making the stem tip slightly longer like Halo and Cream stems. Too loud for office use but more satisfying soundwise.
6. More details of my Mauve build can be found over at Keebtalk:
https://www.keebtalk.com/t/easing-into-linears/6855/323?u=donparkUPDATE2: I won't be getting H1s as-is because a) I already have Mauves (it's mauvelous) and b) 78g is too much for me. But I'd order in an instant if the mentioned 'modification' is longer stem tip for that addictive CLACK!