San Diego JS is a presentation based meetup and we found that a lot of attendees were also interested in classes where they could work on actual code while having the ability to get advice and ask questions.
JSU is not intended to compete, but to fill that need without causing confusion as to what SDJS is. Using a separate, geography-agnostic name also allows us to expand the concept to other cities if anyone is so motivated.
Also, it would be nice if the times for the workshops were on the first page. Thanks!