My Cable company now has M-Cards for TiVos. I am exchanging them. They charge $5 each, but counts a free cable box. My two TiVo HDs use four S-Cards and I am charged $15 a month. If go to M-Card it will cost me only $5 a month. Is there anything I need to be alert for when I change from 2 cards to 1 in each TiVo. Should the installer just take out the two S-Cards and replace them with a M-Card, then just go throught the regular setup?