I'm going through the same decision process, looked at all the feedback so far, and have landed on the 'wait and see' side for the Fulla. Hopefully, the various build issues will be non-existent in several months.
Since we're setting up another listening station for a desktop computer in the next few weeks, we're trying to decide cheap (E10K) vs upgradeable (E07K). From our perspective, the E07K solves two needs:
1. A truly portable DAC/AMP (i.e. battery driven) with the E07K and...
2. An upgrade path with the E09K that gives us another amp at home capable of driving higher-impedance headphones.
Even though the sound quality may be a tad worse, we'll likely follow the E07K & E09K path because the portability is something you don't get with the Fulla and there are really no build/quality issues reported for this combo that I've seen.