Our bike store at work actually has a similar concept. They made a section of the concrete up the side accessible with a wheel, which works but is far from optimal. You have to question the intelligence of someone who designs that into a dedicated bicycle storage area (built with the building, so not a later addition). The only advantage over a metal trough is better grip when descending, but less clearance to the wall so a greater angle is required.
it's tolerable with an unloaded bicycle, but just about anything else makes it far worse, so heavy panniers (or other bicycle bags), trailers, tricycles, tandems etc all become various degrees of more troublesome.
We do have a second storage area with level access (ie a gate in a wall), which I mostly use these days since it's closer to my office, but it's entirely uncovered so less friendly on days with inclement weather.
