Probably depends on the honesty and integrity of the ISP.
I have a wireless LAN 512Kb connection, but some of the security features incorporated into this IP software regularly drop my connection under certain conditions. Like too many IP requests, or too much data flow from my Mac card will time my antenna out. Also they work on the software during the day without giving any prior notice.
Also they never return my phone calls in a timely manner when I need assistance and there is no one on duty at market open when a lot of the disconnects occur.
Probably the best recommendation would be to talk over these items before going with them and don't get into a long term contract until you're satisfied with the connection and the support.