I have never heard or tried NS10 myself, but I understand that many find them very good and they are still used in many professionell studios.
When I purchased my monitors; Yamaha HS50m, some people I trust, in regards to music gear, compared NS10 with HS50. I compared HS50 with serveral well-known brands, including KRK, Adam, Genelec and Focal.
For My liking Yamaha beat them all! I prefer a clean and "honest" sound. In mixing this is key for me. I did find e. g. Genelec lacking some "clearance" with too much bass. I understand that people like different sounds, but for me, I go with Yamaha any day:)