Yes, it works fine both with my Samsung Galaxy S5-mini and my android tablet. I had problems at first getting it running correctly, and it seemed like the program guide was displaying old (past) programs. I un-installed the channel, and also went into the channel directory in Plex and drilled down to the Tablo channel, and blew it all out. Then, I did a fresh reinstall.
Bandwidth is a problem, and I have mine set quite low (only about 1mbs) so that I don't lose the signal because of bandwidth limitation on the train. When I go away for the weekend, or on business, I bounce it back up, as I will be using it from the hotel. In these cases, 2 mbs give a nice clear picture, even hooked to the HDMI port on the hotel TV.
(Worked great when we were assigned to Korea and visited Guam!)
Are any of your Plex channels working outside of the home? HGTV is a good basic one to test with as it doesn't use any device-specific encryption like many of the others. It's comfortable with the 1mbs cap, too. Given that you're getting channel info and the program guide from the Tablo over to the Plex, I would take a look at your PLEX data out rate. Are you able to send any other program content to your cell phone or tablet from PLEX?