Had a set of these before they rebranded them from Ultegra to the RS500. I ended up tacoing the front wheel in a sweet maneuver and had to replace the wheelset.
These are great quality. Excellent weight to price ratio, and as I mostly ride these on gravel, good durability too! So far at least.
I've had these now for a few months and probably have 500 or so miles on them consisting of several 25-ish mile rides and a few 50 miles rides. I've had no problems with them. They are smooth, fast, and attractive. I would have never believed that wheels, particularly at this price, would have an appreciable effect on my speed. But then there I was, looking down at the computer, ride after ride, until I became convinced that I had picked up 1-2mph. And the old wheels weren't particularly heavy!
There are lighter and faster wheels but get to a significantly better wheel, you would probably need to double the price and then some.
So, if you are a casual rider who needs to replace their wheels and wouldn't mind a modest increase in performance, get these instead of the bargain basement wheels. If you have an entry-midlevel bike with stock 2000 gram wheels, this would be a sensible upgrade (and weight saver) for those without unlimited budgets.
The hub is quiet-ish, not silent, but not annoying.
The wheel set arrived well packed, true and in perfect shape. Noticed when spun the rear wheel it didn't continue rotating very long and was noisy. Possibly the bearing seal were dragging. After a hundred miles the drag went away but the noise from the hub remained. I will take them apart for inspection or have a bike shop take a look.