Digital BW, The Print

I just got around to testing the RC papers that came in the Lumijet 
sample pack.... One in particular, the "True Pearl" gave me a 2.57 with 
the K3 inks on the 3800, at the 'normal' settings. As comparison, Epson 
Semi-matte produced a 2.36 at the same settings. 

Does anybody know anything about the stability of this paper?

Regards,

Steve Karafyllakis