Same here. I have Brighthouse, and while I've never had problems with the service they recently upped the price on the HD DVR box to 19.95 a month! The InfiniTV will pay for it self in about 12 months with the cost savings of not having to rent a box.
If I needed a multi-tv setup, I'd definitely look into a Q + echo setup, but since I only have one TV the InfiniTV works just fine.