Digital BW, The Print

i've used this software and have gotten good results.  results are
what the company claims.  in my experience, i've gotten better results
using only 2, maybe 3 images rather than 4+ images.  the only negative
i have is that there is considerable distortion on the periphery that
you have to correct for in photoshop.  but it does deliver higher than
native resolution, less noise, higher dynamic range, etc.  i'm sure
the software will improve in later versions.

if nothing else, try it out for 30 days to see if it works for you.