The headboard will be up against a wall with windows on it and won't be flat against the wall portion. I want to know if it will be wobbly if I'm sitting up in bed leaning against it.
Skyline Furniture Swoop-Arm Wingback Headboard, King · More Info
We would always recommend that upholstered headboards are securely fastened to a sturdy bed frame or some attach to a wall. It should be fairly sturdy if this is done, however it is at a starting price point/quality level, and may not be 100% waiver-free.
Walter E. Smithe Furniture and Design