There have been a couple of posters who claim to have managed to revert, but reading between the lines I suspect some serious heavyweight effort, persistence and time was involved - many other people have been told a straight "no" and there's been a couple of tales of VM offering outright disconnection rather than a reversion. That's probably a pretty good indicator of how difficult it potentially was.
I know previous posters have said it’s a voluntary upgrade, but it just doesn’t feel very voluntary when promoted by CS and there seems no way back to TiVo
It is voluntary. Of course VM are going to promote it - that's entirely to be expected. If you want to remain on the TiVo platform and are offered a migration, a polite but firm "no thanks" should be sufficient.
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