Baldy: The SP101 is a J frame on steroids...the Speed Six is a larger platform...but just a tad bit smaller than a S&W K frame. Many, myself included, have felt that the Speed Six/Security Six series were the "perfect" size/weight/ergo for the .357 mag bullet. Bottom line...it really is a superior gun to the SP101. Alas, I dropped out of the bidding at $435. I was bidding on gunbroker.com. Damn...I feel like I lost a kid. Ah well, I will keep my eyes open and there is, after all, a major gun show coming to my location in WA in August. I really wanted a SS model...but a blued version really does look nice. Ah well, win some...lose some.