Obviously these are old recordings (early 1950s) so the sound quality isn't great, but it's mostly perfectly OK. Toscanini is one of the all-time greats, so if you already have the Beethoven symphonies by someone else, this is an interesting comparison. The NBC Symphony was a darned good band too, so there are no problems there. The interpretations are pretty traditional but as far as you can tell, Toscanini knew what he wanted and succeeded in getting it. In the end, you can't ask for much more than that. As noted in one of the other reviews, the tempos are on the quick side, though looking at other recordings for the lengths of movements, other conductors are not always slower. The last movement of the 9th symphony is a case in point - Toscanini does it in 23 minutes - about 5 minutes faster than Bohm or Furtwangler. But it all makes perfectly good musical sense, even to someone who recently had probably his only chance to sing in the chorus so knows it even better than he did from umpteen Proms performances.
If you're not sure about classical music, this is a far better introduction than any of those Classic FM "Even better than the last best ever classical collection" collections of 10-minute snippets, and probably about half the price.