Compared to modified grand piano box. Advantages of WING: easy to install (anywhere, no bolt required), easy to install (cut a hole, insert into the wall, turn the screws to open and press the wings against the wall). Slightly cheaper / wide availability. Cons: Fragile, may feel like attached items are bending; Depending on the spacing between the studs and the quality of the wall, there may be sagging (or, if you're clumsy), cracking in the wall area. Be careful with steps like breaking off…