I would very much like to read others' opinions and information as well.
I went to quite a few Sundays at the Buddhist Priory here in Portland, which is connected to the OBC. I had very positive experiences. The monks there have been kind, instructive, and patient with me often not knowing what the heck to do during the ceremonies.
I did stop attending for a few reasons. There was nearly a weekly ceremony, some of which were hard for someone with no formal training or study in Zen to penetrate the meaning of. There also weren't enough teachings of the dharma for my tastes. I wondered if it was more like a priory with resident monks who offered to share their practice, versus a center geared more towards lay people. The extremely small sangha of regular attendees (two or three) may indicate it's the former. I haven't attended the Dharma Rain center. I wonder if I should give it a try
Another reason I stopped, I don't know if this is a good one, is I found some concerning information about the OBC in general online. Complaints about any charismatic teacher or rigorous monastic style are going to crop up, so I didn't care much about those. I did find what appeared to be a support forum for ex-monastics and people who had gotten deeply involved in the OBC then left due to concerns. The fact that it wasn't just one or two people but several corroborating statements gave me pause.
There were claims about actively repressing discussion or questions, ignoring student concerns, extremely hierarchical tendencies, and parroting the founder but not really knowing how to help the student along... Some said they felt they hit a brick wall in different areas and left. There were other things but I don't remember them at the moment. It was enough for me to stop going to the priory. I can share the link to the forum if it would be appropriate.
I don't mean this to be hearsay and gossipy. I didn't find any similar complaints about the other main Zen organization in my state, the Zen Community of Oregon, so it was very concerning to me. I hope this thread can clear up any misunderstandings or be a source of information and discussion on the OBC.