I'm using a DigitalNow Quad DVB-T Receiver because I wanted everything in the one box. I note that they are currently unavailable with no ETA. That is a shame.
The network tuners do look like a great idea though, and I would consider using one if I needed to add another tuner, or wanted another PC to have direct access to a tuner.
As it is, my antenna outlet is right next to my HTPC anyway, hence the desire to put it all in one box and not have extra bits of hardware hanging about.