Most of the information I find about Qur'an-only versions of Islam tend to be from some random webpage. Some examples are:
Quran-Islam.org. Some of the articles (possibly all) are attributed to someone known as "A. Muhammad".
QuranMessage.com by Joseph A. Islam.
Looking at random articles from these sites, aside from the Qur'an, the only references I found were to other pages on their respective sites; they don't even cite each other. It's hard to tell, therefore, which scholarly opinion Quranists value.
Question: Which scholars are respected by Quranists?