On my setup they are very easy to read while in motion. However my setup consists of three monitors running at 5760x1200. Disregard, I went to one monitor at 1920x1200 and they are also very easy to read.
If the addon airport has custom signage, you will not see TaxiSigns HD by FlightSimTools. if on the other hand they are using default signage, you will get TaxiSigns HD by FlightSimTools.
What would of made this an excellent deal is if they also provided replacement taxiway/runway edge/center marker lighting.
Are these new signs easier to read while you are rolling? I find that I have to pull right up to the default signs and stop to read them, so I just follow the progressive taxi instead. The $15 would be worth it to me if I could read them before I passed them.