Sumiko cartridges are sensitive to Overhang and Zenith. Use a protractor (preferably the Stevenson or Baerwald alignment). The "smile" turns into a muddy mess if the cartridge is even 2mm off in the headshell.
The Sumiko Smile is often described in audiophile circles as having a "classic" Sumiko sound. If you are used to clinical, analytical cartridges (like some Audio Technicas or high-end Ortofons), the Smile will sound different. sumiko smile best
Avoid: Bright, analytical amplifiers (e.g., early Class D amps or certain NAD models) paired with metal-dome tweeters. This fights the "smile" and creates a harsh "frown." Sumiko cartridges are sensitive to Overhang and Zenith