SONICblue reserves the right...

From http://www.tivo.com/support/pvr_serv_agreement.asp?frames=yes

TiVo may, at its discretion, from time to time change, add or remove features (emphasis mine) of the TiVo Service or change the terms and conditions of this agreement. Such changes shall be effective upon notification by TiVo. You are responsible for viewing any new terms and if you are dissatisfied with any such changes to the TiVo Service or this agreement, you may immediately cancel your subscription as provided in the "Termination of Service" paragraph below. TiVo also reserves the right to discontinue the TiVo Service altogether at any time in its discretion.

Apart from the fact that TiVo says they'll give notice, I don't see any difference between the two...