EI (Engineering Index) conferences are generally considered to be of good quality, especially in the fields of engineering, technology, and applied sciences. EI-indexed conferences are recognized for their academic rigor, and papers presented at these conferences are often peer-reviewed. However, the quality can vary depending on the specific conference.

Here are some key points to consider when evaluating the quality of an EI conference:

1. Reputation of the Organizers: Conferences organized by well-known academic institutions, research centers, or professional associations tend to maintain higher standards in terms of content and peer review.
   
   

2. Review Process: The quality of the peer review process is a critical factor. High-quality conferences often have a thorough peer-review process, ensuring the research presented is credible and valid.
   
   

3. Impact and Citations: Papers presented at high-quality EI conferences are often cited in subsequent research and publications. Checking the citation index and the conference's impact factor can give you a sense of its academic value.
   
   

4. Speakers and Attendees: A high-quality conference usually attracts prominent scholars and researchers in the field. The caliber of invited speakers and panelists can indicate the quality of the conference.
   
   

5. Proceedings and Publications: The proceedings of a quality EI conference are typically published in reputable academic databases like IEEE Xplore, Springer, or Elsevier. You can check whether the conference papers are indexed in these databases to assess the conference's credibility.
   
   

In summary, while EI conferences are generally of high quality, it is important to evaluate each conference individually based on its organizers, review process, academic impact, and reputation in the specific field.