PCI-E Passive Riser Cards - Has anyone ever tried them?

[multi#lord]

I came across several of these, and had the idea putting one in an lga1156 mini-itx to split up the single 16x slot for multiple PCI-E slots.  They are apparently designed for servers, have no PCI-E controller, has anyone ever tried them out?

http://www.wiredzone.com/Supermicro-RSC-R2UT-2E8R-2U-PCI-E-x16-Right-Side-Riser-Card~10019543~0.htm



http://www.govgroup.com/supermicro-computer-inc-rsc-r2uu-2e4e8r-pci-express-riser-card-2436590-prd1.htm

[DeathAndTaxes]

Your host (motherboard) would need to support lane splitting and multiple end point assigned to a single slot.
It is part of the spec but my understanding is 99% (# pulled out of my ass) don't and nobody indicates if they do or not.