Well, I'm embarrassed to say that even as an experienced Linux user, I managed to brick my GoFlex Home when following the instructions to the letter (I think). After a seemingly successful install, I shutdown and rebooted the GoFlex. However, I didn't first configure my laptop with pseudo ethernet ports for use with nc (perhaps the advanced tab should explicitly say to do that first?). So I didn't see any of the console messages upon first reboot of the GoFlex with Arch and UBIT installed. I installed them to a 2GB flash USB drive.
I even tried wireshark to look for any traffic generated by the GoFlex while booting, but didn't see anything.
Any suggestions besides getting a USB-TTY adapter?