I'm selling my KSB 3.1s soon and upgrading one of these. I can get them for about the same price off of ebay and ubid...about $600-620 delivered. The specs seem to be about the same, except that the KLF-10s produce deeper bass from what I can tell. I figured that the KLF-10s would be better since they were a more upscale/more expensive model and are bigger, but then again the RF-3s are newer and seem to use higher quality materials so having had no experience with either I'm not sure. So...any opinions?