Had a bit more of a play with the app last night. It's fine. Pretty basic. Nothing amazing. Navigation is quick and content starts streaming very quickly so can't complain on that front.
Couple of glitches whereby the on-screen programme info and status banner doesn't disappear after 5 seconds. It does this for me on Landscapers Ep1.
Can't really see myself using it much, if at all. The NOW app is much better.