Eric,
I find the RJ-45 jacks useful, as long as the board is mounted in an out of the way location.
For visible locations within my house, however, I find them unusable. I blend components into the room as much as possible to reduce their visibility. Since the RJ-45 jacks are exposed (not to mention the two cables) this rules out the use of the RJ-45 jacks for me. The screw down terminals and an extra blank without the RJ-45 cutouts allows me to hide everything except the box itself.
If you are creating some new boards, a smaller form factor box would be much appreciated where possible.
--
Jayson