Just discovered this agency

What good does it do to recommend a website where we have to give them our email address in the blind in order to see what you're talking about.  You won't find ladies from this place on TER because TER requires a website link that is accessible to the general public.  Girls from password-protected sites cannot get their reviews approved.  Accordingly, your post is worthless except for the few morons that are willing to give up their email address and have it sold to other sites as a potential customer for sex services.  Unless this is a soft-shill for which you are receiving something in return, you're a moron, too, if you gave them your email just to have look at photos.  

Elite Login Required. Must create an account.

...and haven't been disappointed. Yes you do have to register to see the offerings.

Where is the agency based?

It's US based, I believe.

I think that's assumed. The question is where in the US??

You'll have to ask them that question.

For those familiar with Sugar, this is her website.

repeat customer to the great booker there for the past 6 years!

I can’t speak for every lady on the site since I haven’t logged in to it. But in my interactions with Sugar, all of her ladies had ads elsewhere. I would be shocked if she is not doing that with all of these ladies. She’s a booker and her goal is to book them. Her website isn’t big enough to maximize bookings. Also, if they have ads elsewhere, despite previous comments, they can be reviewed.