I'm an Omni Plat this year. I stayed for 5 nights at Omni San Diego with a conference rate through the hotels website section of the conference this summer. My Omni Guest number was added to the reservation and I was upgraded to a Junior Suite at check-in, although it was quite depressing, so with some chatting at front desk, I was further upgraded to a normal suite, which was very nice.
This year I've got 5 nights and received an email with an offer to extend to Plat with just one additional night, so I'll have a single night at the rest of this year at Omni.