nope. never have had water problems. drains in less than 15 minutes usually (when i water). we have an insanely small yard, so this is really the place to do it.
i figure if we start to have problems, i can give the plants to someone else and redo it with just one slope away from the house. it will at least have been a good learning experience (in native plant selection, etc.)
i planted the tall bellflowers so they will be visible right in front of the 3 windows. and i figure the height and wetness will provide a decent security barrier once plants reach their full height.