Positive: This reel to reel recorder made many master tapes all around the world's top musicians.
Negative: Not in production anymore. Bulky, difficult to service. Spare parts you need to buy on ebay.
If you can get hold of some really good reel to reel tapes- like master tape copies, be prepared for musical reproduction which you are not used to- but it just sounds so right. But the ulimative transparency might be compromised by old electronics and wiring. I wonder what output would be from machine being modified by today's standards.