The ATSB recently published a report on 250 stall related events it has investigated over the past 5 years, it would seem that those aircraft with "speed protection" were less prone to stall events.
News: Stall warning events
" As a rate per hours flown, stall warnings were more common in Dash 8, Boeing 767, Boeing 717 and Fokker F100 aircraft, although for the F100, almost all reports were for the aircraft’s stall warning systems activating spuriously. Stall warnings were found to occur in all flight phases and a range of aircraft configurations, not exclusively those related to slow speed, high pitch attitude flight, or flight in poor meteorological conditions."