I own the Stax 4040 system and think it's fantastic. The 404 Signature phones are very detailed, well-balanced, and musical. The direct-drive 006t tube amp is a wonderful little gem. For $925, it's a great bargain. I think it will be snapped up quickly by someone who recognizes the performance level and value. The tube amp should be quite reliable. The tubes are a common type and relatively easy to find when needed.
The one downside I noticed is that the phones are so good they will make you aware of your speaker's shortfalls.
The one downside I noticed is that the phones are so good they will make you aware of your speaker's shortfalls.