In my opinion, Red X malt is a 1-trick pony. When used as 100% of the grist in a 1.050 beer, once it is clear the beer is a gorgeous red color that you just can't get from any other malt. The downside is that it is also very malty-rich in flavor. YMMV, but the flavor is just too much for me. It's like a Dunkel with a bunch of extra Melanoiden or Aromatic malt added - it becomes so rich where crosses the point of enjoyment for me.
On the other side, when used in lower portions of the grist, you don't get the full color effect. I'd rather use roast barley or a crystal malt to get a ruddy color in a beer at that point.