Clayshooter,
I've used the Safariland and HKS speedloaders and greatly prefer the Safariland Comp II over the Comp I, and any Safariland over the HKS. I've read nothing but bad reviews about the Maxfires, and in some reviews, they report that they either lost rounds from the speedloader, or damaged the revolver unless perfect alignment and technique is used. Masaad Ayoob, among others, speaks to the loss of fine motor skill when shooting under stress, which tells me that if I owned am 8-shot S&W, Thunder Ranch would be shipping me some of their speedloaders, unless Safariland or HKS can step in with one of their products.
Best of luck,
Dave