How old is too old for a Dac?

OP
In other words, how old is too old for a dac?

When you and your family, friends, have embraced a technology that the old DAC no longer supports.  

@ ct0517

Do I need to clarify that my question was regarding SQ?

Spoogemonkey

IMO - You need to form your own opinion before buying/committing, especially if there is a large $ outlay.

With digital, I would bring my existing DAC (whether it is a CD player or a dedicated DAC), whatever your current reference is, into the Audio Salon and have the dealer substitute it in, with the others they are offering and compare. This allows for multiple comparisons at different price points.

This will allow you to form an opinion.

fwiw
I have been told by different dealers in the past that the digital business is on a 2 year cycle as far as product turnover, new product is concerned.

Its all down to listening at the end of day.

I bought an Audiolab M Dac plus a few weeks back . I really like it.

Spoogemonkey,

To follow up, I suggest you set a budget for your DAC, and then choose two or three used components currently selling at that price, plus two or three current/new DACs at the same price.  For example, if your budget is $500, then look for used DACs currently selling around $500 regardless of their original retail price.  Audition and compare them in your system with new DACs selling for up to $500.

For new components you need to work with local dealers who will let you borrow demos.  Use forums and trusted reviews to narrow down your choices.

For used, as long as you don't over-pay and don't keep too long, you should be able to purchase and re-sell without losing any/much money.  For used, again I suggest to keep it to not more than five years old. 

As for Bryston, Ressonessence or any other brand, new or used really depends on your budget.  I mentioned specific brands because I and/or others I trust, have generally positive experiences with. If new ones fit within your budget, consider them. If only the used ones fit, then consider those instead.  Oppo as others here have mentioned also do well at their price point.