Digital BW, The Print

Paul,

A while back you were very complimentary about Epson Semi Matte. You 
mentioned that it had a Wilhelm rating of 200 yrs. I checked it out on the B&H 
sight and found that it was referred to as a proofing medium for its color fidelity 
(positive if your doing color) but what made me nervous was that it also 
claimed excellent short term stability. 

Can I rely on this paper to be archival. To hold contrast and tone over time, or 
even - for the infrequent occasion, color?

What is your experience/recommendation? 

Mike Kitei