Pay special attention to the bed frame. The frame is one of the most important aspects of selection as the structural integrity of the ottoman depends on it, and also whether it will be able to sustain the weight of a heavy mattress.
Ottoman bed frames are usually made of either wood or metal. Metal is cheap and extremely durable. But it lacks in aesthetics and is more suited for rustic or contemporary interiors.
That’s why solid wood furniture remains ever so popular. It blends with just about any type of décor. But it costs a pretty penny, especially if you are looking to get a custom one made for you.
If you are buying off the shelf, ensure that you are aware of the type of wood used. Chipboard glued together might have a polished finish. But it will start to wear with just months of use. MDF veneered bases are slightly more durable. But not as durable as solid wood.
Check the joinery, the hinges, the screws and the pistons used for the folding mechanism and the storage sections.