Your enjoyment of the visuals will vary depending on how much you enjoy cg animation and since the focus is on the mobile suits the characters play a small part if at all, however the highlight for me was the sound. There is little to no background music and that along with good use of stereo at points gives the sounds heard a sense of realism and immersion to them. Because of that the videos overall did give me the impression that I was watching "classified footage" so for that reason alone I suggest checking these out. The biggest flaw really is the length, ZZ Gundam Frag is a tiny 8 minutes in total so don't expect it to have an impact on you. Regardless since it's a sort of bonus video I never expected it to be anything more.
NOTE: If you have not yet seen Gundam ZZ itself I highly suggest against watching these as they contain a few spoilers and you probably won't understand what's going on half the time.
