This is a most desirable pair of discs in so far as it is such a generous survey of works beyond the Songs without Words. This new and remastered edition offers an improved sound over its predecessor.
Barenboim proves to be an ideal guide to this highly lyrical outpouring of Mendelssohn and it is the lyrical side that is mostly stressed. It needs to be noted that the remastering in the later edition rectifies the rather shallow and bass light sound balance of the previous edition and provides additional clarity too. The sound is now clearly preferable to my ears in this newer mastering.
This pair of discs includes far more than the complete Songs as it continues with the Kinderstucke, Gondellied, the two Klavierstucke and concludes finally with the very popular Albumblatt. This comprehensive selection is unique on disc and makes the set even more attractive. However I would also suggest that the partial survey of the Songs plus other works by Sebastian Knauer is a worthy competitor with even better sound and equally sympathetic playing.
At the moment Barenboim has the added advantage of a very low price on this lower priced and re-mastered complete edition compared to Knauer' selection. Knauer has the advantage of sound quality plus arguably even more attractive playing. My suggestion would be to buy both Barenboim and Knauer if at all possible.