Oh shit, didn't know about Triforce and Chihiro being usable on NetDIMM also. That's pretty sweet, actually. Now I understand why the units are expensive. They're definitely worth the pricetag for how much you can play with it.
I would assume only the ones that use the netdimm would work with triforce and chihiro, so both Chihiro and Triforce Type 1 games only. It would be worth it to me because:
1) Probably wouldn't need the battery that the netdimm has, so previously loaded game would not be erased if the board has not been booted in a few days, and one less battery to worry about
2) Once the game is loaded, it should work just like a cart (like the cart conversions of gd games)
3) Ability to swap games without restarting the mobo
4) Ability to select bios from the game select screen (like neo sd)
6) If board requires less power, you should be able to run with the capcom I/O
5) Possible access to game soundtracks via jukebox mode
6) Ability to load games that require the 1 gb memory without buying more stuff (chihiro)