Since I live in the greater Cleveland area, I suppose it's natural for me to have an affinity for Szell's Beethoven--although my standard of comparison is always Furtwangler. What makes this recording great, however, is Huberman's incredible immersion in the Beethoven (he's no slouch with Tchaikovsky, either!). He was not afraid to take risks! There's a grittiness to this performance that puts it right at the top of my choices of performances of this concerto. It certainly deserves multiple hearings. The cadenzas are particularly brilliant, and this is one of those 78-era recordings that has a particularly beautiful sound, I suspect even before the fine remastering job Naxos has done. There are a few such recordings that stand out in my mind, not the least among them Rachmaninov's own recording of his second concerto.
The restoration of the Tchaikovsky is very nice, too, but I think you'll notice that the quality of the original is not up to the standard of the Beethoven.
I've had the opportunity over the years to hear a number of note-perfect, pretty, phoned-in performances of both of these concerti, both live and on records. You may have had this experience--the performance is wonderful while it's happening, but a half-hour later one has a hard time remembering what one heard. This is definitely NOT such a performance of the Beethoven. It's one to remember. While audiophiles may not find the sound altogether pleasing, if you care about these concerti, this CD belongs in your library--and at Naxos' incredible price, one can hardly afford not to own it.