A while ago I tried FT8 with the IC-705 using a USB cable from the PC. As the noise level was high, I stuck with the FT817ND and SignaLink instead. As I have now got a good screened and choked USB cable, I shall try again later.
UPDATE 0858z: Well it works on TX with a spot by G0FWX (160km), and I think it works on RX, although nobody spotted yet. At the moment it gives 5W without the ALC coming on. Assuming all is fine, I shall probably download WSJT-Z, which goes back onto CQ TX after a QSO. With WSJT-X it goes to RX after a QSO.
UPDATE 1005z: Working on both RX and TX. Initially I was seeing none of my RX spots on PSKreporter, but there are lots now as well as lots of TX spots. Best DX on TX is a spot of me by ZS6KVZ (9120km). No QSOs yet. I wonder how much better FT8 is than SSB? Having worked ZL with 10W SSB some years ago, I am pretty sure I can get DXCC on 10m FT8 if I tried. Not sure I really want to try. 10m FT8 at 5W seems too easy!
UPDATE 1802z: Spotted by 36 stations on 10m FT8 TX with 5W. Furthermost is
DP0GVN (13687km) in Antarctica. Other reports from S.America, Middle East and China. 10m FT8 certainly works with the IC-705.