Forget everything you thought you knew about what death metal could be.
This album—the final Death album before frontman Chuck Schuldiner's final appointment with a brain stem tumour—redefines the genre and is a fitting testament to a man who was famously difficult to work with, due to his obsessive perfectionism.
Everything about this album is world-class; the guitar sound, the production, the songwriting, the musicianship.
My previous point of reference for Death was the album "Spiritual Healing", which was a typical late 80s/early 90s progressive death metal disc; a much cleaner sound than the earlier "Leprosy" (which has a primitive appeal, even now) and a social conscience in the songs, but still relatively simple. "Perseverance" is on another planet, and the riffing and guitarwork is up there with Dark Angel's "Time Does Not Heal" (considered by many to be one of the finest examples of thrash metal riff-writing and execution ever).
This is one of the best metal albums ever recorded.
And if you don't believe me, steal a copy of the final track, a cover of Judas Priest's "Painkiller".