I do rel=next/rel=prev,
IF it's truly a single article broken into multiple pages like
domain.com/new-widget-article.html - New Widget Article
domain.com/new-widget-article-2.html - New Widget Article - Page 2
domain.com/new-widget-article-3.html - New Widget Article - Page 3
If it's a series of related articles on the same topic, (with different titles), then I don't do rel=next/rel=prev. In the first instance, Google consolidates the entire three pages into one. (usually the first in the series). You generally don't want that happening with a series of articles with sufficiently different titles.