Whenever there is a Furtwangler reissue from a major record label such as EMI or DG, there comes a chorus of critics the size of the Wiener Singverein shouting "you can do better." This raises the following questions: where can you do better, how much better can you do, and at what cost. The short answer is: on various import labels such as Audite, Naxos and Tahra, you can do marginally better, and it will cost you plenty.
The fact is, you just can't get a broader base of Furtwangler recordings, covering a variety of Classic, Romantic, and Modern orchestral works than you can here at this price, plus you get two complete operas.
While EMI's reputation for remastering is deservedly poor, the source material for this set is the best available. The majority of this set consists of studio recordings made in the early 50's. A studio recording in good 50's mono is going to sound better than a live recording from the 40's no matter how good the remastering of the 40's recording is.
There are also those who deride Furtwangler's studio recordings as not representative of his art or in some way less spontaneous and therefore inferior to his live performances. They are somewhat less spontaneous, but in exchange for that loss of some spontaneity, you get much better ensemble playing and a lack of audience hacking and orchestral gaffes - both of which can be severe in many of his live recordings. Also, these cough's, poor entrances, and questionable intonation become less endearing with each repeated listening. It is in repeated listening that the studio recordings show their worth.
In a nutshell, this is what you are getting:
Disc 1: Beethoven 1 & 3, Wiener Philharmoniker (VPO), studio, 24, 26-28.XI.1952.
Disc 2: Beethoven 2 (live, 3.X.1948, Royal Albert Hall) & 4 (studio, 1-3.XII.1952), VPO.
Disc 3: Beethoven 5 & 7, VPO, studio 28.II & 1.III.1954; 18-19.1950 respectively. The 7th has never sounded better.
Disc 4: Beethoven 6 (studio, 24-25.XI & 1.XII.1952) VPO, & 8 (live, Stockholm Philharmonic, 13.XI.1948).
Disc 5: Beethoven 9, live, Bayreuther Festspiele, 29.VII.1951.
Disc 6: Beethoven Piano Concerto #5, Edwin Fischer, studio 19-20.II.1951; Bartok Violin Concerto #2, Menuhin, studio 12-13.IX.1953.
Disc 7: Beethoven Violin Concerto, Lucerne, 28-29.VIII.1949 (as remastered by Testament); Mendelssohn Violin Concerto, studio 25-26.V.1952, Menuhin.
Discs 8 & 9 Beethoven Fidelio, studio 13-17.X.1953.
Disc 10: Brahms, Hungarian Dances 1, 3, & 10, studio 4.IV.1949, Haydn Variations, studio 30.III & 2.IV.1949, Brahms 1, live 27.I.1952 all VPO.
Disc 11: Brahms 2, live 7.V.1952 BPO (notes incorrectly say VPO), Brahms 3, live 18.XII.1949, BPO - the notes say 8.XII.1949 VPO, but that is incorrect.
Disc 12: Brahms 4, live, BPO 24.X.1948 (notes say VPO, but again it is the BPO); Beethoven Coriolan Overture, studio VPO 24.X.1948, Leonore Overture #2, studio BPO 4-5.IV.1954.
Disc 13: Brahms Violin Concerto, Lucerne Festival Orchestra, studio 28-29.VIII.1949; Brahms Double Concerto, live 27.I.1952 (Boskovsky, Brabec, VPO).
Disc 14: Mozart 40, VPO, studio 7-8.XII.1948 & 17.II.1949; Tchaikovsky 6, BPO, studio 25-27.X.1938.
Disc 15: R. Strauss, Don Juan, Till Eulenspiegel, Tod und Verklaerung, VPO, studio 1954, 1954, 1950 respectively; Furtwangler Symphonic Concerto (2nd mvmnt only) studio, 25.IV.1939.
Discs 16-19 Wagner, Tristan und Isolde, studio 10-22.VI.1952.
Disc 20: Haydn 94, Cherubini Anacreon Ov., Schubert 8, Liszt Les Preludes, all VPO, studio, 1950-1954.
Disc 21: Remembering Furtwangler (audio documentary).
So... if you are looking for improvements to what is offered here and money is no object, I would recommend the following:
Beethoven 3, live BPO 08.XII.1952
Beethoven 6 and 5, live BPO 23.V.1954
Brahms 3, live BPO 27.IV.1954
Brahms 4, live (same recording as here, but better remastering from a better source) 24.X.1948
all available as part of Edition Wilhelm Furtwängler - The Complete RIAS Recordings. An excellent Bruckner 8 comes with this set, and you really should hear his Bruckner. Also, the Brahms 3 from the EMI set is duped here, but in better sound.
Beethoven 9, live 22.8.1954, Philharmonia Orchestra
available here Beethoven: Symphony No. 9 (8/22/1954).
Brahms 1, live, 1951, NDR Orchestra
available on Tahra but no product link (search for it).
As a supplement to the above, I recommend the following other recordings by Furtwangler:
Wagner: Die Walkure [Martha Modl, Leonie Rysanek, Margarete Klose, Ludwig Suthaus, Ferdinand Frantz, Gottlob Frick; Wilhelm Furtwangler] (1954 EMI Studio recording; Remastered on Naxos Historical)
Mozart: Symphony #40/Piano Concerto #20/Serenades #10 'Gran Partita' & #13 'Eine Kleine Nachtmusik - Wilhelm Furtwangler, Berlin Philharmonic - dupes Symphony 40 above, but has other items of interest.
Bruckner: Symphony No. 4 / Haydn: Symphony No. 88 / Beethoven: Coriolan Overture, Op.62 / Schumann: Symphony No. 1
This list could go on. The wartime recordings from DG are interesting, but sloppy and in poor sound. You can easily find them on Amazon if you are interested. Try and get the CD versions of the DG sets, as the MP3 versions are not gaplessly encoded.