''Newly recorded fuller version'' it says on the Chandos jewel-case and booklet. That means that the Borodin Trio have now restored Var. No. 7 in the second movement (the one with the big piano chords) which they mysteriously omitted from their earlier, 1985 recording (it was the succeeding fugal variation which Tchaikovsky was willing to have cut). What they don't do is open out the 16-page cut in the final variation (again sanctioned by the composer)—admittedly with some artistic justification, because the passage concerned is doggedly repetitious, but it does mean that Chandos's labelling does not tell the whole truth.
If you really want every note in the score you have two superior versions from EMI to choose from. Neither is ideally recorded—Ashkenazy and Co are given a harsh studio ambience, with a distressingly tinny piano; the Chungs sound just a fraction too mellow and distant. But in technical and interpretative matters both ensembles are to be preferred to the Borodin, who are tonally less refined and who tend to smother the music in generalized short-term expressive surges. The earlier Borodin version (like the Ashkenazy/Perlman/Harrell, without coupling) was all the better for letting phrases breathe, rather than heaving at them, and was noticeably more exuberant in the Theme and Variations.
For myself I think I would plump for the Chung Trio, not least because they include a fascinating rarity—Shostakovich's pre-First Symphony Piano Trio, Op. 8 in the completion by Tishchenko. And for lovers of an older style of music-making Rubinstein, Heifetz and Piatigorsky, on RCA and coupled with the Mendelssohn D minor Trio, offer rich rewards (they do gabble the finale, though, and both composer-sanctioned cuts are made). Incidentally, Philips have deleted the Beaux Arts's recent recording, which RL preferred to all the listed comparisons, after only 18 months in the catalogue—if they are lining that up for recoupling and mid-price re-release it could be difficult to resist.
I'm glad to have heard the A minor Trio by Alyabiev (composer of the famous Nightingale, sung by Patti and others and transcribed by Liszt). This is not of the quality of, say, Glinka's near-contemporary Grand Sextet, but it does have some charming whims of its own within a broadly Mendelssohnian framework. It seems a little more closely recorded than the Tchaikovsky (it was made in the same Essex church, but on a different occasion), but in both instances Chandos have given the Borodin Trio a good blend of warmth and clarity.'