Here's my experience today in the local OP branch. I have no previous relationship with the OP group.
- the campaign for free plat service for owners is confirmed IRL
- I would need to book a separate appointment with some special CS who handles new customers (!!)
- I would need to have OP as my main bank, meaning having my salary coming there for 3 months (!!)
So I thanked the guy and left. Too much hassle for a few lounge visits, which I can probably get at £20 a pop.
If you're already an owner, no reason not to go for it, though.