I don't understand the other reviewer's comment about the sound quality on this recording. After reading the rewiew, I listened to this CD with great concentration at home and found absolutely nothing to complain about the sound. To my ears, this is what a great ensemble sounds like when it is interpreting a great masterpiece (in this case, two great masterpieces) and when it is not trying to be too polite about its way with these works and play them through just like your quartet next door. Maybe the reviewer just got a defective copy?
Indeed, I have found the same issue with quite a few reviews here at Amazon. Many reviewers shower praise on a recording and then there always seems to be one or two who have a completely opposite view, and the thing they complain about is often the quality of sound. Sometimes this happens also with professional reviewers, and not only at Amazon. I suspect this is something that has to do with the different sound systems. In spite of the fact that music lovers usually try to seek out and purchase the best (and that includes the most affordable to them) equipment on which to listen to the music they love, there must be considerable differences between the resulting sound. How otherwise to account for such discrepancies between the reviews? When such a thing happens, the prospective buyer just has to "read between the lines" to try to decipher the nature of the problem and whether or not the CD is actually worth purchasing.
A while ago it seemed that certain CDs I had purchased had some kind of bias in their sound that emphasized the left stereo channel. I was quite mystified by this as the reviewers obviously had not encountered this problem at all, at least it was not mentioned in the reviews. Then I found out that the problem was in my equipment, not in the CD: after I had manipulated the balance knob a little, the sound "fell into place" and the problem disappeared.
EDIT: I have now solved the above problem and it appears that the fault was NOT in my equipment! My loudspeakers were located too high on the bookshelf, and once I lowered them a few inches, the problem disappeared! This is just to illustrate what kind of conditions can seriously affect the listening experience. Ideally, the loudspeakers should be located approximately at the level of your ears (or just a little above) when you are sitting comfortably in your chair and listening.
I have bought several reissues in the "Hyperion 30" series and all of those have very good sound. On the basis of my listening experience, I can recommend this reissue of the Takacs' fine 2006 recording with confidence.