If you spend your money wisely on a good tub chair then you will be rewarded for it. The quality of the build and materials should provide durability and comfort that the less expensive kinds don’t have. This means you will have a chair that can stand more use, and not show signs of wear and tear. The fabric should be soft to the touch, and stretched nicely along the contours of the tub chair. Even after a few years, this fabric will still feel warm and inviting.
All the joints and springs should hold the structure together very well, and you will not have any funny noises coming from inside the chair. Good hardwoods such as oak and ash make the most solid joints because they are hard wearing yet flexible to take the weight.