Features a slow noisy startup. ISDN is popular because it's cheap in Japan.
Cable is popular in the U.S., and is slowly gaining customers in Japan.
Leased line is also fixed fee, but is guarenteed to be fast. Typically called T1 or T3. This business thrives as more and more high-rise buildings block the transmitions from Fushimi's famed TV Tower. Depending on your area, the construction of your apartment, and the whims of the building's owner, cable may be impossible. But for now, the small number of customers means speeds are generally high.