LMSC Owned the Feld 2 couple of years, plus Aergrind and recently bought a J-Max which is a flasher rendition of the JX-Pro.
Can’t really go wrong with the 1ZPresso units IMHO, they are built by a firm of engineers and the build quality is very good, an absolute joy to my finicky little soul to use. Really fine adjustment on J-Max, totally ok on mate’s JX-Pro too. I still love my Feld2, but it’s had its fair share of minor QC issues which I fixed myself because let’s just say the MBK customer service is legendarily Pythonesque