Here at Springwave we hear this less than you think.
1 in 5 people who buy a shower will need parts in the first year. Normally that part is only some door wheels or something small that has been used incorrectly or warn.
3 out of 5 people will buy a unit from us and never contact again because they will just be so happy with there unit and never have any problems.
When you buy a high quality unit you will have a much longer lifespan on them. Nearly all of our units are 360 glass which means they will not discolor over times when cheap make brands are made from acrylic and discolor over time which means a replacement is always need after about 1-5 years.
So when buying steam showers and whirlpool baths or any type of bathroom unit make sure you save up for the best quality you can afford, you will be 100 times happier with your unit and it will last a lot longer without needed parts or maintenance.