"it has no interactive feature."
True. If these are important to you (they aren't to me) then you should wait.
Got this off the VM site:
Red Button functionality will be coming in the future to our TiVo service. You can check our progress in the Customer News area in Help, on your TiVo box.
Even less reason to wait any longer. Especially since I hardly make use of this facility on Sky. I'm moving over to VM.