If we're citing our experienced worst providers, mine was also a Niki, but the Niki from Blackrock. She posts on Listcrawler constantly.
Clockwatcher, rushes you, cbj only, rates fluctuate constantly, tries to get you to do some shopping for her on way there. You book and pay for 1 hr, she will push you out in 40... and by 20 minutes shes saying "u gonna cum? Youre almost out of time." And will only fuck in doggy style.