I am a big fan of the DP Merrill series. I used to have the DP2M and DP3M. I was totally disappointed about the later generation sensors of Sigma. Even the newest one can not beat the Merrills.
The only disadvantage is SPP. I just can not understand why Sigma is not paying Adobe the money to have a good RAW converter inside of Adobe Lightroom. The sales would have sky-rocket.
What software do you use to make your DAM (digital asset management) with the Foveon files?