The parts in a commercial elliptical are usually made of metal, and less overall plastic is used in the constructions of the elliptical trainer. This ensures less premature wear and a longer lasting piece of equipment.
There are many different types of elliptical trainers as well as brand names and options that are available when choosing an elliptical machine. There are home grade elliptical trainers or commercial grade elliptical trainers. What are the advantages of purchasing commercial elliptical machines vs. home elliptical machines? Well the most obvious reason to choose a commercial grade elliptical trainer is the fact that they are built more durable to handle allot of use.
Very few people truely need a commercial elliptical trainer in their home. Usually a traditional elliptical recommended for home use will be more than enough. If you have multiple family members consistently using the elliptical trainer you may want to consider a commercial elliptical as it will likely last significantly longer than the lower end machines.
Put quite simply yes they are worth the additional costs involved to purchase one. The higher quality parts and additional features are usually well worth the added cost.
The first major drawback is the size of the unit. They are usually larger than the smaller "home models." Another drawback is if something does break on the machine the parts cost quite a bit more and you usually need a professional to come out and repair the unit.