As Kr4 says, it depends. I tested a pair of powerlink devices, though not the Asoka variety, and while they worked, the throughput wasn't any better than Airplay from an Airport Extreme base station.
And, as he suggests, if the two outlets you're connecting aren't on the same leg in your breaker box you may get no connection at all. On the other hand, the powerlink modules are cheap enough that you won't have lost much trying it.
And, as he suggests, if the two outlets you're connecting aren't on the same leg in your breaker box you may get no connection at all. On the other hand, the powerlink modules are cheap enough that you won't have lost much trying it.