Instruction: Answer the given question using the supporting document.

Input:
Question: Is this unit solid built, I mean metal of some type or just palstic outside the unit?
Document: Using the direct on the cd-payer makes only a slight difference. The unit is high quality. It is both well built and attractive, although it shows finger prints easily. I am a big Yamaha fan and own many products from their sound system line (PA stuff). I have never had one problem with anything they make. I bought this as an open box item for about $257 plus shipping. I looked for months for a deal on one, but it is too new I think.
I researched all the multi disc units available & concluded this was the best. I get the impression that these type of players are going to be obsolete soon so I want the best unit I can get now before they are extinct. I agree with some of the other reviews, the difference in the sound was amazing. Fuller bass & overall a warmer cleaner sound. This unit replaced a 24 yr. old Sony multi disc player that served me very well. I chose the Toslink digital optical connection.
This is a quality player . the case is well built, not some cheap plastic housing. Sounds great and nice features. Easy to use, 5 stars in my book. I highly recommend this product.
Anybody looking for a dependable changer for a high end system, using an external DAC. I would say that the Yamaha 600 changer is solid, and dependable, warranting a closer look. MJ
This is a very good sounding CD player regardless its price. Good circuitry and solid materials are used to build this high quality player.
I had a Yamaha CD changer that got too old and it was really good so I researched some CD changers and decided on this one because it was reviewed highly and because it was a reliable product based on my own experience. It really does the job. It has a built in DAC and that is a terrific feature that my old one didn't have. The music sounds great! Highly recommended.
I remember a boss of mine 20 years ago, when we still made goods in the US, who told me that "the customer is the final quality control inspector." How true this turned out to be, and while having to return items (with increasing frequency regardless of the type of product, toaster, toaster ovens, electronic equipment) is an inconvenience, at least Amazon makes this an affordable, if inconvenient quality-control method.
Every type of product has a "sweet spot" between cost and performance. This CD changer (one of a dying breed) truly does combine great sound and value. When the Yamaha arrived I put in my "benchmark CD's" (Deep Breakfast, Lattitude, Julian Breen, Manhattan Transfer, and Vivaldi) and rediscovered the fullness, richness and proper spatial-relationships of the instruments (staging for audophiles).
Great, I have owned Yamaha products for many years, and their quality are comparable with products twice their priceAnd I'm use to own the best, price, more expensive doesn't mean better, and quality is what counts, in some products you paid for the name, not in Yamaha
Then I returned it.I feel Amazon's quality control on this unit was disappointing.
Answer: It is metal nice and simple