I have an SPS .223 that I bought recently to replace a ruger .223. I'm building it up slowly, have a new stock + trigger on the way. I was going to replace the barrel right away but it shoots exceptionally well, sub-MOA 5 shot groups easily. It'll be getting an action job, and a new 20 or 22 inch 1:8 twist stainless tube when I get bored with shooting 55grainers, but for now anything I point it at dies so I am not too bothered. The interior surface of the barrel is horrible though, there are tool marks visible to the naked eye.
I intend to shoot the barnes TSX and 75gr Amax out of it when I get the new barrel
I'll never be without a .223, it's far too useful