Here is a pics of the FX700 case. Similar to the FX850 but noticeably smaller. I found it quite cumbersome to use this case with the FX700s and ended up stop using it. I was also worried about ruining the connectors using this case long term.
The FX850s definitely hit above their price range IMO. So does the Flat 4 Sui. But they are no 1Plus2. Different leagues IMO. I owned both. Going from the 1Plus2 to the FX850s makes the FX850 sound muddy and congested.