The Modem performance is very good, but the only problem I find is sometimes I cant hear the dial tone and so totally unaware of the status, because some times auto dialing starts and we are unaware of it. speed wise it is good. The modem is also dead cheap compared to external modem and no bother for adapters. Also I found this modem not so easy to install as all my Bus are full with various cards. I could also find the Driver files for The modem easily on the internet. It also works fine with standard modem driver files in setup.