The Zr24W is certainly a good display, I'm using one now and have been for months. No complaints really, especially given the price, when I bought it, it was over £100 cheaper than the Dell and also has the 'advantage' of not being high gamut, at least I considered that an advantage and still do for now.
I have no idea about the scaling issue though, I only ever use mine at native resolution hooked upto a computer so it's not a feature I use. There is an option to alter the scalling in the OSD though under image Control > Custom Scalling, you can sellect Fill to Screen, Fill to Aspect Ratio or Overscan ...whether or not this works properly though I can't say.