Years ago when the Nexus 7 first came out I got hold of one from a local shop. It was attached to a badly damaged beach cruiser that UPS had crushed in transit. I had nearly nothing invested other than my time stripping down the bent up bike.
At the time I had an upper mid range road bike with a full chromoly frame, 1" tires, and its original Araya A20 rims.
I built that hub into the rear wheel, found a set of alloy north road bars and set the bike up as an upright cruiser.
It was a tall, 64cm frame, which fit me well as a road bike. However, when converted to an upright bike, the bike was miserable to ride. The frame flexed with every pedal stroke, the rear hub felt 'heavy' in that bike, and the upright position made the weight distribution a problem with the narrow tires.
The hub never shifted well, I tried the original twist grip shifter, then went with the trigger set up, but shifting was vague.
The roller brake worked well, but added more weight, and to make it worse, I added a front roller brake.
The roller brakes worked great but they would overheat on downhill stops, which soon killed the front brake and boiled the paint off the rear brake assembly. I scrapped the roller brakes and went back to calipers.
The gearing was fine, I was running 48x20t cogs, which if anything were a bit low but I didn't stick with it long enough to make any changes there.
I ended up putting the bike back to stock and selling it. I then tried the hub in a 1987 Schwinn High Sierra mtb, but never really liked how slow it shifted and how long it took to run through the gears.
I did pick up a Jamis cruiser at auction about 12 years ago with one factory installed, but that behaved the same way. I ended up removing the Nexus 7 in favor of a newer Sturmey Archer 3 speed hub. I sold the Nexus 7 on fleabay and sold the bike to a neighbor a few months after that. It was a far nicer bike with the SA 3 speed. The funky push up, push down and twist grip shifters were the biggest issue, you never knew what gear it was in, even though the push type shifter had a gear indicator, it was never aligned correctly and would never stay adjusted. There was just too much slop in the cable and all the plastic parts.
I got the impression that Shimano built the hubs and then bought the shifters from Mattel or Hasbro.
These days i stick to older SA AW hubs or coaster brakes.