I use two Sony 300 disk changes, chained, in my office system. Sound is not really affected if you are using the original cd's. I have found that when I use burned cd's, done on various computers and software, the units will sometimes not read them. Since SonyStyle is free shipping and they will come take it back at no charge for return shipping if you are not satisfied, little to lose. I've never felt the 'burn to hard drive' is worth the time. I have close to 15,000 cd's. Time better spent listening and reading the jackets.