I recently bought a Hafler DH220 stereo amp for $10 at a garage sale. One channel doesn't work and it was just taking up space so I put it on craigslist for $25. In the ad, I included the fact that the right channel doesn't work, and I forgot to include the model number and still within 15 minutes, I recieved 10 emails. What is up with this amp? Is it worth fixing? Why do so many people care?