It is certainly well advertised on google and people I know get calls, however with so many timewasters I find it not worthy to pay such a great amount of money per month, especially if you have multiple subscriptions it will all add up. However if you are requested on other websites, then it ok to go for it.
Best thing would be to be in the Vip section, where you will get noticed.

In London a normal ad, Standard ?100 Vip ?330 where there is less competition, but check the difference with Usa.
In Usa ?72 in and ?171 Vip Ads
If you don?t live in London then it is cheaper starts from ?50 / Vip ?200
I find it a bit confusing as they categorize ladies by independent or incall/outcall/ebony/brunette.so on? and other categories ,,, Therefore if a punter is looking for a particular lady, he might not see her unless he browse through all categories ?
I also find it out of the ordinary because when clicking on a category, a window appear in the middle of the screen with links to other websites, and the ladies, even the Vip are on the left of the screen.
I am passionate about websites and check as many details as I can. For ladies/men/Ts

You don?t fancy ukadultzone or adultguide? Simpler and easy to use.

Get a Premier in adultzone for 5 credits, and you will appear between the first of the gategory, pay 7/8 gbp and you ?ll get a unique visibility.
Adultguide 75/ 3 months.. end up on a hard copy magazine too, found in hotels lounges ,,,
I tend to like websites where can advertise free first, and then later gaining a better exposure by paying for the upgrade.

6 Things I use as essential parameters
-Can Show Rates
-Photos of course
-Tel Visible to paying or not paying members 
-Can insert own website (to specify details that you normally cannot say on their web)
-Also Admin must be active and answer the question or solve problems fast.
-Last not least easily found by google keywords.

What men type when looking for a lady ?
-Lady -sex -specific location or -London only, Scotland Liverpool etc ....
-Woman -Massage - London
-Sex massage lady
-Full body lady sex  and lots more..you want to be on these websites ...
Punterlink is a good source too of course

Good luck