Really want those weapons, but solo queuing on Harbinger...Yeah, that's not happening. At least I'll have the crystals...
I do hope they reuse those effects for something in the future, though. Different looking weapons, same flame effect...as long as they make sure it's incredibly hard to obtain (and I don't mean 10,000 Cartel Coins )
EDIT: And as someone noted above...a lot of people on Live have no idea these rewards even exist. Maybe in the future you can advertise them in-game? have Baron Deathmark send everyone a mail with a list of prizes to get them interested.