Yes it is. You can purchase it via Steam. However, in order to access it you will have to download STO and play it through Steam itself. The ship comes as a bundle and includes an account wide unlock of two class of ships. A lower tier level ship that comes with a special console, two or three bridge officers and some extra stuff and of course the T5 Steamrunner itself which comes with stock equipment.
It goes on sell occasionally, I had purchased mine for $12 or $13 dollars a few months back. Otherwise it cost in and around $22.00. Is it worth the price? Yes. The ship itself comes better equipped than the Tier III Fleet Defiant and when built right is pretty great. In fact, PVP coaches via Boot Camp list it amongst the top escorts to own.
Just don't discard the lower tier ship until you obtain the special console! Enjoy.
"The world ain't all sunshine and rainbows. It's a very mean and nasty place and I don't care how tough you are it will beat you to your knees and keep you there permanently if you let it. You, me, or nobody is gonna hit as hard as life. But it ain't about how hard ya hit. It's about how hard you can get hit and keep moving forward." - Rocky Balboa (2006)
download and play via steam: nope.
after purchase there's a code to see somewhere on your steam account (something like bought games or so).
that you have to take to your sto account settings on perfect world page (/forum, top every page).
that should unlock the steamrunner to your existing game .
...of course you can play via steam too.
Klink: House of Beautiful - J'Luc / Rommie: Lag Industries - D'Waste
Join Date Hoster: Dec 2011 - Join Date Symbiont: 1403 A.D. and not a dull moment
Best would be if for ANYTHING IN THE GAME U COULD CHOOSE BETWEEN GRINDING PVE OR DOIN PVP... AS FOR ME, I DONT WANT TO PVE, PLZZZZ LET US PVP!