I upgraded my Indiegogo Omnia and had no problems. However, there have been issues with some devices (or: at least one):
The last messages on that thread seem to indicate that there is still work going on to fix remaining RAM training issues. However, that is now weeks ago and there has been no further feedback…
So, if you currently don’t have problems which a new u-boot would solve and/or you don’t feel comfortable with using the serial console in case of issues caused by the upgrade, maybe better wait for a solution of the remaining RAM training issue. Otherwise, the linked thread should give you the information you’ll need in case you run into issues after the upgrade.