The current standard driver (.27) is stable but has a serious flaw with recording offset in it's WDM component.
The consumer beta (.31) works fine, but doesn't support low latency.
The professional beta (.29) works for some people, but has reportedly crashed some systems (including my own).
You'd expect less than perfect stability from a beta, but you wouldn't think a seriously flawed driver (.27) would continue to be posted as the standard recommended driver.
I continue to do all my recording on the consumer beta (.31), the only one that works for me.