I've had a Pub Prop for some time, and, although it does the job of using a table as a guitar rest, I started looking at what others were using. I finally bought a Planet Waves Guitar Rest and have discovered that it does the job equally well, with a massive improvement in simplicity.
The Planet Waves Guitar rest could not be more simple - you lay it on the edge of a table and prop your guitar on it. That's it. The Pub Prop, however, has a screw threaded clamp to connect it to the table. That is fiddly to use and is particularly difficult on certain types of table that have edgings sticking downwards.
The Pub Prop has a little bar that can clip across the neck of the guitar for extra security. I stopped using that as the guitar was equally stable without it. I suppose it might be marginally helpful if someone bumped into the guitar or if there was an earthquake, but I've never wished that I'd spent the extra time securing and un-securing that clip.
The fact that the Planet Waves Guitar Rest is not fixed to the table means that it can be easily moved along a bit to make a bit more room for someone else. Between songs in a folk club, it feels like a major work of dismantling and reassemby to move a Pub Prop.
Having used both in action,now, I would recommend the Planet Waves Guitar Rest every time.