It's funny that you asked that. I feel like I'm either completely missing something or the other benefits are so light - they're almost just there in name only. It's really just the lounge offerings from my perspective. There's a dedicated desk, and it's great, but I'm not sure how that's such a huge perk when you never stand in line more than a few minutes in the lobby. And I've been sent to the lobby more than once for things they couldn't do in the lounge. You may get a little pixie dust here or there for something by the CL staff. But that can happen from the front desk staff, too. Even the turn-down service (which I love) is very hit or miss. I've even asked about it at check-in to make sure they're still providing that and they confirmed that I will receive - and I didn't get it.
I love CL, but to me perks are purely the lounge offerings. Am I missing something that others find really beneficial??