I have recently met people who are Reformed Baptist. However, I'm having a hard time understanding what their major beliefs are, especially in comparison to other Baptists. The Wikipedia article gives a good overview of the history of the group, but doesn't summarize the major theological beliefs.
Do they still hold to the defining Baptist tenet that only adult baptism is valid? Are there other major differences between them?
a generally Calvinistic (ie "reformed") view of the state of man and the doctrine of God (typically shown in the acronym TULIP) vs a typically Arminian view of God and man
a strict view of credobaptism (which, while similar to other baptists, also sets RBs apart in that child "dedications" are rare (though not considered heretical))
a very strong view of the church universal, and as displayed in local bodies
an understanding that there are Christians in other denominations (which separates RBs from Landmarkists or "Grand Ole Church" baptists)
a staunchly-held view of the regulative principle of worship (RPW) which manifests most commonly in highly-esteeming the public reading of God's Word, the centrality of preaching God's Word, public prayer, and an eschewing of the "latest and greatest 'church ideas'" in favor of conservative views of dress, music, translations used (though I have never heard of a KJVO RB church, the tendency is to favor formal equivalence translations to all others in most scenarios)
a rejection of Dispensationalism as both inadequate and aberrant in its teachings, especially with regard to eschatology and the so-called "church age", and its typically-attendant love of charts and graphs outlining when and where biblical prophecies are being fulfilled