noplsestar
Headphoneus Supremus
If you are not looking for fancy DAC options, the Vorzüge amps are still part of the best of the best portable amps to find, especially when considering that they are - for their power - extremely small (in comparison to other portable amps) and that they have an analogue quality that is hard to find in products like chord, that more feel digital.AFAIK amp tech hasn't really had any kind of major evolution since then*, but portable amp stacks in general seem to have fallen out of fashion, though there are still a decent number of options available- mainly replaced by more versatile DAPs, a big shift toward IEMs over headphones, and ubiquity of small usb & bluetooth dac/amp dongles due to so many phones dropping headphone jacks (as well as a few successful larger portable dac/amps like Chord Mojo, iFi Black Lable, Fiio Q5).
*Vorzuge do have the Duo if you want tone controls. The THX brand "AAA" licnesed amp designs have become very popular, but I think all the portables are combo dac/amps like the Monolith, Q5s (also, idk that they are necessarily that much different than other measurement minded amps like the Pure). There've been a few other developments like the Korg Nanotube, but doesn't seem to have made huge inroads as of yet (there's a DIY kit you can buy from Japan, the DX220 DAP has a modular nanotube amp).