Much appreciatedGadgets like the Ultra are really a gamechanger when it comes to equipment setups. Their ability to act as pre-amps including volume control and the possiblity to hook up a TV via HDMI ARC make integrated amps without built-in streamers and dedicated pre-amps obsolete.
Power amps are becoming more and more interesting on the other hand, also to people who couldn‘t have cared less about them in the past.
Take an Ultra, connect it to a competent class-D power amp, decent speakers and you have a very serious just two-box setup.
Having said that, you should look into Purifi implementations by Apollon, Buckeye and others before getting those cheapo Fosis. The outlay isn‘t that much more. In return you get a better amp, more power reserves and just one box. The Fosis will be four boxes plus all the cables. Dreadful.
I agree about the Fosi V3. Would like to just have the Ultra along with a plain power amp. Preferably something without any switches etc on the front.
