Sorry guys, but thus far, it sounds like x1 slots are pretty marginal - aside from enterprise setups.
So for a desktop PC, don't see the need for one. Unless I just need extra audio channels.
PCI-E 1x slots are basically there to replace PCI slots. They are far easier and cheaper to route on the motherboard, physically smaller and much higher performing (250MB/s to 1GB/s depending on PCI-E version, versus 133MB/s for a common PCI slot).
I don't really get what it is you're trying to accomplish with this discussion. Are you trying to justify the continued existence of conventional PCI? Why wouldn't there be a need for a general purpose expansion port with decent performance in a modern computer? Expandability is one of the main advantages of having a regular PC. What would you propose that we'd have instead of PCI-E 1x?
As for the original question: I use PCI-1x for an ASUS Xonar DX (soundcard) and for a TP-Link 450Mbps triple-channel wireless NIC. Given the fact that conventional PCI support is slowly fading, I'd never spend any money on such cards these days.