20 songs in and I'm enjoying it quite a bit. There are some very inspired moments throughout - the outro to Invisible comes to mind, as well as the arrangement on 11 O'Clock.
The standout for me so far is absolutely Dirty Day, though. I love the sparse arrangement, and the guitar tone on the main riff is intoxicating. It really goes to show how effective Bono can be using his voice as an accompaniment rather than the main draw - I really, really wish he would take that approach more frequently.
The straight acoustic versions are just kind of there. The guitar on Wild Horses sounds great, but not great enough to justify an un-embellished 5 minutes. Edge is generally more effective painting with atmospherics than he is as a riffer, which I guess is a consensus view anyways.