It seems the street has yet to figure this out, as Netgear's kit costs more at retail than Comtrend's, and only slightly less than ZyXel's.
Now the D-Link DHP-701AV achieves its high speed via proprietary enhancements, but the ZyXel PLA5405 is pretty stock. As for the Comtrend PG-9172, we're recommending consumers wait for additional G.hn products to ship before jumping on that particular bandwagon.
The physical size of Netgear's adapter is another reason to leave it on the shelf, too; it's tall enough to block the top tap in your wall outlet. You could spend an additional $10 per pair to buy the Netgear Powerline 1200 + Extra Outlet (Netgear model PLP1200-100PAS), which provides a pass-through electrical outlet. That's a feature none of Netgear's competitors currently offer, surprisingly enough, but the extra cost won't deliver any extra performance.