In fairness the CDS3/555PS is the nicest CD player i have heard, and i did own a full 555 for a while, which is even better in most ways, but not all.. However in my opinion a well recorded LP through an LP12 or similar will always be preferrable.
My situation is that for 25 years i ignored everyone that said CD's were great and only bought vinyl, however 2 years ago i purchased my first CD player purely on the basis that i was fed up with missing out on so much music. Since then i have been through nearly all Naim's current crop of players from 5x onwards in an effort to get somewhere near the satisfaction that my vinyl player gave. Along the way with the CD players i have gone up the current Naim ladder in amplification also but am realising that i'm actually getting less pleasure in listening than i did with my chrome bumper Naim stuff with the LP12, and mostly but not all i think is down to CD itself, however i may point a small finger on the current Naim presentation in general. Having been devoted to the line since the early 80's i may have a re-think, even if that means trying some old school stuff again.