My fear of these Chinese tuner adapters is there are quite a few reviews detailing a short lifetime for the tuner, constant reboots, lack of proper instructions for setup and other problems.
Just bought a used TiVo Premiere off Ebay with lifetime $179 have much more confidence in this unit.
I currently have 4 HD TiVos 2 lifetime bought for ~$100 each several years ago, other 2 are unsubscribed (@$35 each) but still can work as tuner with pause (30 min buffer) and no guide.