I thought I would do a quick write up of my observations so far using Plex DVR.
I purchased a HDHR4-2DT 'Connect' tuner from Amazon UK. It came in at $180.
I also purchased a Plex Pass (pre-req for access to Plex DVR).
1. If you are thinking of replacing your OpenPHT client with another device, you may encounter 2 issues
a) Your client device is highly likely to require the server to transcode. I hope you have the CPU power for this, I didn't.
b) If your client device does not skip or fast forward in a responsive and accurate manner, watching content with adverts in it will be a nightmare
2. If you are familiar with a traditional guide interface you are in for a surprise with Plex DVR. Instead of the usual table of channels and times, you will be presented with shows that will be on that week. So if you want to find out what is on at 10am on Saturday you are out of luck. But after the initial confusion of this it actually makes good sense for finding shows you didn't know were even showing. Helpful for a household which never see adverts.
3. The guide data is rudimentary, so helpful Plex DVR options are less useful. For example Newshub does not appear in the News category, it is lumped in with Shows. You can only schedule shows using the Plex web interface.
4. Plex will attempt to gather metadata for shows it finds in the guide data. There is still about 50% of the shows missing cover art. Once a show has been recorded you can then use the usual interface in Plex to apply your own cover art.
5. It's been reliable so far.