they are like way overpriced I almost have lvl 34 on my hunter (nearly 300 hours on it alone) and still rocking a green speeder.
Update 6/13/15: After restraining myself from buying weapons and armor I actually want for stats I managed to buy one and upgrade it to a legendary was 90% disappointed with the legendary speeders they aren't all that much faster the contrail colors are cool but ultimately its an aesthetic thing not a functionality one. managed to get another rare one via crucible parts. In the end I feel that they are even more grossly overpriced than when I was lusting after them.
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git gud
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You'll get a free rare sparrow when you get all five golden chests on earth. YouTube is your friend here. If you've got the strange coins to spare, grab an upgrade from Xur while he's still here. 10 minutes and you go from uncommon to legendary. XD Or you could do a raid. The Timebreaker has an infuriatingly high drop rate in VOG.