So far very happy with the R2 and DumaOS 3, I'm now getting near max broadband speed (400MBs) with congestion control enabled. Initial installation was not completely smooth, initially the router could not get an internet connection and I was confused by the fact I couldn't connect and setup via ethernet. I had to read the manual (who reads manuals before trying a new gadget!) before I realized I could only setup via WiFi. I have no idea why it wouldn't get an internet connection at first but I reset the LAN IP subnet to my usual range left everything else to defaults and rebooted the netduma and the internet router and everything worked.
I like the ping heatmap - would be great if we could chart the ping values, download the data or have a sparkline graph for each ping node so I can quickly see the ping over time