Benchmark DAC1 using Toslink input

Hi -- does anyone have any experience using the Benchmark DAC1 thru its toslink input? I am considering auditioning it with my iMac G5, which has a toslink digi out as well as a USB port.I dont know whether to audition the new USB model -- $300 more expensive -- or the older model which has the toslink input. Toslink has a bad rap in audiophile circles, but I'm not sure it's always deserved. Any input would be appreciated. Thanks. -- David