[rsheridan6]

I've done it and I didn't find it at all cultlike. They had a donation booth at the end with no pressure to actually donate, and that's it. Nobody's tried to contact me or pressure me or anything like that. Most of the retreat is spent in silence.

As for the links you posted, the first one had a bad experience at an incompetently run retreat (it was tl;dr so I didn't finish it - maybe there were more problems). I can say that I was well fed at the one I went to. The second one is by an obvious lunatic who was mad that they didn't recognize that he's many times more egoless than they are. Other reports trashing the retreat that I've seen (and I read a ton of them before signing up), with the hindsight of having actually done it, mostly come across as people who feel like losers because they couldn't finish the retreat, so they blame it on anyone but themselves.