The trem works on a reverse concept compared to a Floyd Rose: the knives are on the posts. The bridge itself has 2 positions where the knives can make contact. Depending on the position which you choose (higher or lower), you get more or less range when using the whammy bar. The response (more or less aggressive) will also change.
I have a Boden 8 string and using the 23rd and 24th frets is clearly harder than on an Ibanez 6 string.
I am waiting for a 6 string Prog neck thru model to get back in stock myself.
IIRC most of the hardware is aluminum with stainless steel for the parts in contact with the string. You can also buy a trem block of another material on their site. I don't recall what the stock trem block is made of. Their support site has loads of information about what is made of what, how it works, and the rationale behind design choices.
I am looking into buying a 6 string strandberg because I like the sound of the 8 string, how easy it is to play (sometimes too easy, I had to change my left hand muting technique a little because of the low pressure needed to make notes ring), the sound even at lower volumes (probably due to the chambered body and the stainless steel frets and fretjob), and the low weight.
In my opinion, the current version of the hardware is kind of a nightmare for a guitar tech working on a tour: there are a lot of small parts. The newer design they launched today with the NX series improves quite a few things. If you play live shows, think about buying some extra screws. Which is not that much different than what you would need with a Floyd now that I think about it.
I am just a person writing, playing, and recording music at home. I used to play live regularly in clubs and festivals. I have also worked as guitar tech for top artists. I am not affiliated with strandberg or any other company in the music or instrument field.
I hope this long post helps clearing out some of the doubts raised in this thread.
EDIT: you can buy the HSX, I forgot to write that
https://strandbergguitars.com/product/strandberg-hsx-hyper-single-coil-circuit/