Digital BW, The Print

I've been trolling around on the group a little for the first time 
today and I've seen a lot of mention of the MIS inks.  I'm curious 
about people's experience with the K4 inks with an Epson 2400 and how 
you guys feel about them compared to the actual K3 inks from Epson.

Also how well do the spongeless carts work?  If anyone knows.

Thanks.

Brian