While we were a little slow out of the gate, we did eventually publish several models. We had assumed we could just republish our existing experiences, but then read the notes more closely about how that wasn't possible. Our first model was a relatively small assembly, and it loaded quickly. Then we published three different LODs of a full spacecraft model. All 3 models loaded relatively easily in the HL. I believe the largest took about 45 seconds. We will share our initial observations about image quality and ability to manipulate the model on Monday. We want to make sure we aren't overlooking an instruction first. All and all, not bad for day 1.
I see that you were facing issue for a republish - if you mean republishing a project, it should be possible. Please let us know the issue in specific, so that we can address and try fixing it.