The remote picture quality is good / acceptable. My remote internet is 25 down / 5 up. My local internet is 75 down / 75 up. I set the Remote Streaming Quality to 3Mbps.
The main reason I don’t like streaming remote is that the Tablo does not let you resume a recording from where you left off. It will prompt you, but it ignores your selection and just starts the show over. Then, it can take quite a while to fast forward to the previous position. Unfortunately, this is a transcoding issue that can only be resolved if I change the Remote Server Quality to Full Quality.