We networked our nerd house in the early/mid 90s, using an ISDN terminal to get that blazing fast 128kbps. Back then, people weren't constantly streaming video, so most of the time when you were downloading stuff (kernel source, Linux distros, funet.fi, sunsite.unc.edu, etc.) you got the whole 128k to yourself.
Most people at the phone company had no idea what ISDN was, so it took a while to find a technician there who could get up provisioned, etc.
Before we lived together my wife moved into a flat and got a landline so she could get online. The phone company installed an ISDN line, great. But when they installed it they never properly explained it to her, so she was using her 56k modem on the ISDN line! I visited and saw how she was connecting, I then showed her that by plugging in the USB connection on the ISDN TA, she could get faster speed and a quicker connection. I don't think she used 128k, but single channel 64k was still a big step up for no extra cost.
Most people at the phone company had no idea what ISDN was, so it took a while to find a technician there who could get up provisioned, etc.