It's a great set, one of the reference recordings of the Beethoven string quartets. It's been OOP for ages; this one could be either a reissue or one of those CD-R reprints. I'd check with the seller before buying.
I guess this is a new naive reissue box set, part of their low-price series. It's available at European amazons pretty cheap as well: http://www.amazon.co.uk/Beethoven-Complete-String-Quartets-set/dp/B0000DET84/
Apparently this set was selling for big prices on the 2nd hand market until this reissue, which appears to be standard CD. Interestingly, Amazon US does not appear to carry it, so maybe Arkiv has a scoop. In terms of dollars to discs, it is not an amazing bargain, but compared to reseller prices, it looks pretty good. Right now I have the complete Beethoven String Quartets only in 3 LP box sets issued years ago by Quartetto Italiano, which I think has been well-regarded. On CD I have the Middle Quartets (only) by The Fine Arts Quartet on Everest, and some of the Quartets performed by the Budapest String Quartet on Columbia, reissues of 1940s mono recordings. I could probably use one or two reference sets.