I have an AKG 702 that has been reterminated to balanced by a fellow head-fier, as well as a Little Dot DAC_I and MKVII+, all running in balanced mode. I find that for the most part, the amp drives the 702's pretty well, although when I listen to orchestral classical music which generally has a larger dynamic range than other music, I have to turn the volume knob up to around 60, 65 or even 70 to clearly hear softer passages on some albums. I had hoped (probably unreasonably) that balanced configuration might change the sound signature of the 702's and reduce the treble energy slightly and perhaps increase bass impact; however, I have found that not to be the case. Rather, in my experience, running balanced just makes headphones louder at the same volume pot positions as SE (as one would expect).
At any rate, as others have mentioned, the Little Dot setup is a solid, budget balanced rig that gets good sound out of the balanced 702's (although this is not really true with balanced K501's, which I also have. The volume knob has to be turned way up on certain classical albums in order to get even decent amplification).