I just had some of the doremi DSDI-20s on a tour I was programming, and we were having problems with them holding settings after powering down. They evertually held, but we had lots of problems with them. Also, there is no way to genlock these, if you need that in your system, so need another box for that.

As for DVI over ehternet boxes, I am doing a show right now where we have some of the Magenta Research boxes, they work pretty well, and have thernet AND fiber outputs (intersting to note though, the ones we got did not have the fiber enabled for some reason).

One problem with most of these boxes though, is that while they use Cat 5e able, they CANNOT run on most ethernet systems. The building we are in, for instance has networking all over the place, the bandwith these use if much higher than ethernet can take (I think they use like 1.6 gbps) so in the end we needed to convert to HD-SDI, which the building has wiring for as well, and then convert back to DVI on the other end. But when I had them all hooked up at FOH before everything was in place, they worked great.