Byron,As far as I can tell the harnesses are very similar. Both harnesses have 4 gear loops, adjustable leg loops, and a haul loop. The Momentum series was recently updated. With this update the Momentum Speed is not in the most recent BD catalogs, although still listed on their website. The Focus SA uses what BD calls SoftEdge. Basically it is able to match the curvature of body better. More surface area = better weight distribution = more comfortable to hang in. Also should hold it's shape better. The other difference is auto double backing buckles, that also come fully undone. This is a great feature because you can put the harness on and tighten it without dealing with feeding webbing through the other buckles eyelit. This will save you a lot of time in the long run!Here are some blown up photos of the Focus SA http://blkdia.bdel.com/marketing/CURRENT_products_hires_jpegs/651026%20Focus%20SA%20Clay.jpgI couldn't find a better photo of the Momentum Speed, so I put the Momentum SA for comparison purposes http://blkdia.bdel.com/marketing/CURRENT_products_hires_jpegs/651023%20Momentum%20AL%20Slate%20frnt.jpg It was difficult for me to tell and hard to find any information, perhaps someone else will chime in.Mahalo, Sumo