Online research has given me the impression that commercial riser cards (even the expensive ones) are plug-and-pray devices more likely to fail than not, but I find it hard to believe that a product so common and useful could be so unreliable. Is my perspective skewed, or are risers really so chancy that it's a surprise when they actually work?
I ask because I'd very much like to reposition a classic-PCI, pro-audio interface and a PCIe 3.0 video card like the HD7970, preferably by mounting them on cheap, flex-cable risers like this
with added EMI shielding and Molex/SATA power connectors. Is this a viable course of action? If not, any suggestions?