Keep in mind that many Bondassage providers are NOT full service. They are often pro-dommes, and they don't on average offer services like a provider would.
Bondassage is a specific and trademarked form of play. Technically only a woman whose been through the training courses can say she can offer Bondassage.
As with everything, YMMV with the lady you play with. If you want to get tied up and have a lady sensually play with you, you don't need a Bondassage-trained woman for that. But I suggest you check out the Bondassage website at http://bondassage.com/ for more info. There's also a SF review on this here - http://www.sfbg.com/sexsf/2010/08/02...kink-your-back