If you know some 5yr olds who can solder, let me know. Soldering correctly is not that simple. I use all Audioquest interconnects, both analog and digital and I have no problem recommending them. I've tried more expensive cables, and less expensive cables (Monster), and while SPEAKER WIRE may make relatively little difference, interconnects can make a very noticable difference. I don't advocate $500 pair of interconnects, and it has a LOT to do with what the rest of your gear is capable of. If you have basic gear, say <$2K for speakers, source, cabling, etc... the cabling isn't going to make much difference. If you've spent $10K, I've noticed that you can start hearing the effects of smaller changes within the system. The rule of thumb has always been 10% of the total system price for interconnects, and I feel that is a pretty good reference.
Next, there's a lot to be said about the synergy of the entire system. Interconnects and wire are the LAST place anyone should be looking for improvements or to alter the sound. I look to the speakers and sources first, then proper SETUP and CALIBRATION, then amplification, then everything else.
I think the Diamondbacks are excellent cables, though pricing could be better. The "welded" ones are not exactly welded, they are more like "fused" together, like fancy soldering, I guess you could call it. I don't know exactly how it works, but it makes for a very well built cable.