This disc recorded in 1974 (concertos) and 1981 (solo works) is a successful remastering (2006) of the concerto recordings in particular. The original LP and early CD versions were both compromised by close balance and somewhat wooden piano timbre and the orchestral sound stubbornly failed to open out. The remastering has adjusted those issues to great effect and the problems mentioned above are no more of concern, certainly when compared to earlier versions.
The result of this sonic improvement is that one is much more able to enjoy the obvious mastery and empathy of Perahia's playing which, in the case of the concertos especially, has remarkable freshness and vitality as well as poetry. These recordings were made when Perahia was still a young man and that youthful vitality and spontaneity seems to be part of the added pleasure of these readings. Mendelssohn himself was a young man when he wrote these concertos and probably shared all Perahia's performing characteristics as demonstrated on this disc.
The sonata was also an early work and shares the lyrical flow of the two concertos and the series of Songs Without Words. The piece in written in four movements which are played as a continuous whole without a pause. This simply emphasises the continuous lyrical nature of the work which does not follow the more complex structures of Beethoven nor does it lead forward to the more emotionally demanding sonatas of Schubert. Nevertheless the sonata remains enjoyable enough on its own terms. The following Prelude and Fugue is a more serious work and is considered to be the most successful of the twelve published. Perahia plays these solo works with the same skill and empathy shown in the concertos.
I would suggest that this disc is arguably the most enjoyable of those offering the concertos with that by Shelley offering the strongest alternative. Shelley offers a different extra item and better recorded sound but that sonic advantage has been much reduced by this new remastering.