Unfortunately they split up, and the lead singer (Chester Bennington) joined Linkin Park and his career went downhill (In terms of the actualy music being put out - not sales)
Jason left the band and was replaced by Bobby Benish as a lead guitarist. During seven years spent as a band they released two albums - Wake me (1994) and No sun today (1997).
In 1999 Chester joined Hybrid Theory later renamed to Linkin Park.
Old tracks by Grey Daze were remastered by Linkin Park.
The sound is nothing like Linkin Park's music, so don't expect that. Its very soft and slow. No rap elements at all.
Some Grey Daze songs, like 'Broken Glas', are said to be early Linkin Park stuff. This is not true at all. The only thing linking Grey Daze and LP is Chester's singing. And the singing styles are entirely different as well.