I know agencies aren't generally popular amongst the cognoscenti, but the more I think about it they are so much easier to book.
I am a really lazy fucker where researching prossies is concerned these days and I find trawling through the bollocks that is AW about as riveting as watching the Open Golf. Booking a decent indie is just really hard work - they don't respond, aren't available etc, etc, whereas you select one from an agency and if she's not showing as away the odds are you will get a booking.
Now I know there are many drawbacks
1. Usually more expensive.
2. Natural dislike of lining the pockets of pimps.
2. Agencies tell lies re services and feedback (but so do indies)
3. Heavy photoshopping, so what you see is often not what you get to the extent that it may as well be bait and switch even if it isn't (but so do indies).
Over the years I have had my fair share of both, and good and bad from both, but I really think I will go down the agency route for my upcoming London trip. It's just so much easier.