Though the MP3 metadata and the Amazon product description date this as 2009, this recording was actually first released in 1948 on a set of twenty-one 78rpm records. Consequently, the (monaural) sound quality is quite poor by modern standards.
However, the performance itself has been considered excellent by experts for many decades. This MP3 version is only one of many re-releases of the recording, including a 3 CD set Bach - St Matthew Passion and an alternative MP3 download St. Matthew Passion.
I have been hankering after a copy of St Matthew Passion for quite some time after hearing an extract on a podcast. This hits the spot exactly; it's a cheap and cheerful version. Don't expect fantastic music quality, but do expect the music itself to make you forget about any sound quality issues!