* Cannot be self administered. (However, clinically conducted and supervised at-home neuofeedback programs are available).
* Can take up to 6-10 session to show results.
Warranties for equipment are usually not necessary due the fact that treatment is either administered at-home or in a clinicians office. Purchasing neurofeedback systems requires a license in one of several healthcare related fields.
So both approaches have pluses and minuses. It's left up to you to choose which one is best fits your needs.