Anti-jitter RAM buffer in DACs, Which have one ? Options

[Pio2001]

In, http://www.tc.umn.edu/~erick205/Papers/pap...html#principles we can read about RAM buffers :

This process is referred to as timebase correction and as stated before, any quality piece of equipment will implement it.

That has been the ritual answer to jitter concerns since I'm on the Internet.

But... if "any quality piece of equipment will implement it", then some non-quality pieces of equipment don't implement it. My question is : which ones ?

The statement "quality piece of equipment" is completely subjective and doesn't give any information. For my grandfather, a "quality" CD reader will be a portable radio-cassette-CD-speakers combo for 100 $ in the supermarket. The "non-quality" one will be the Fisher-Price toy for children from 3 to 7.
For an audiophile friend, the "quality" CD player will be the 25,000 $ Wadia CD Transport+DAC, while any player under 1,500 $ is just worthless crap.

So, do a 200 $ CD Player always have a RAM buffer ? Or is it not considered a quality piece of equipment ? What about a 300 $ CD Player from 1990 ?

[Patsoe]

...
3. MISSION people knew what they were doing when inventing a new digital interface ( no SPDIF on these devices ) for their hi-quality CD drive / DAC combo's , with good old handshake signals to sync the timing ....

Yes, this is something I really don't understand about "high-end" hardware brands. Such two-way traffic not only provides best results, but it is also much cheaper and easier to design. Since it (presumably) sounds better, they could still sell it at the same pricepoint at which transports-with-ultra-hyper-cool-stabilized-clocks and DACs-with-four-stages-of-PLL are sold nowadays, while saving themselves a lot of hassle.