I guess that the two very recent reviews were prompted by DC being screened on the excellent British TV channel Talking Pictures. (I watch more films on it than all the other TV channels together.) The film's based on fact though I couldn't find much about Stafford Parker on the Web, save that he customarily wore a large white top hat!
David Farrar didn't fully convince as Parker, his slight build making him an unlikely victor in his gritty fistfight with the far larger Niall MacGinnis. But generally the acting was very acceptable and I was impressed with the realistic grubbiness of Klipdrift and its residents - a welcome contrast to the neat towns and smarty-turned out actors of most American Westerns.
At least three of the cast had appeared together in "A Boy, a Girl and a Bike", released the same year as DC: Honor Blackman, Diana Dors and John Blythe.