Jurinetblade said:

Plus there is the fact that much of their fluff equipment is based around Fenris' weather patterns and climate (I'm looking at frost weapons here) and they do have Njall Stormcaller

Blood angels have always been my favourite chapter, but i no longer play 40k any more, but loads of my mates still do, and one of them showed me the new BA codex. I read about the new Stormraven, it does sound pretty awesome, but i read the history behind it.

The Blood Angels themselves found the STC Template for the Stormraven and gave it to the Grey Knights, but when the Adeptus Mechanicus decided not to allow production (basically hoarding the STC template, putting it into a vault or some-such, never to see the light of day) the Blood Angels decided to ignore the orders of the mechanicus and build the stormraven themselves, and only giving out small amounts to the grey knights.

So the Stormraven is basically unique to the Blood Angels, with limited numbers available to the Grey Knights.

I may be a bit wrong, i was only half reading it at the time, but i think i got the gist of it.

Clarification: The AdMech were "checking the validity of the pattern".  During that time, they made a few for the Blood Angels and the Grey Knights.  After 200 some odd years of testing, the Fabricator General just signed off on the design as a 'legitimate STC design' and aproved it for all chapters to use.  But, as that was like 5 years ago, it has yet to really be distributed.  (the most recent version of power armor was aproved a couple hundred years ago and it's still not fully distributed).  Basicly, the Fluff says why Blood Angels book, but why anyone could use one with their own chapter markings for games like Apoc or such.

Quicksilver said:

I remember reading almost the same about the Land Raider Crusader when it was introduced with the Black Templars. It takes a lot of time for new equipment to be distributed to several chapters or be accepted by the AdMech.

With the Predator Anihilator the Admech took 200 years to give the Anihilator variant their blessing.  By that time the most space marines had been using the Anihilator variant for 190 years.

It seems that it only takes 10 years for a pattern to spread amongst the Astartes.  Marines don't wait for Admech blessing.  I guess if the Admech decide that it doesn't have their blessing the Marines will stop using it (well some chapters will).

I don't know if anyones got the new Imperial Armour book from Forgeworld but the SM featured chapter in that is the Raven Guard. A chapter known for it's rapid hit and run style of combat that's exemplified by the Jump Pack troops.

Personally I felt they were rendered a obsolete by the clearly faster, clearly more jump pack troops of the BA Codex. So I wonder if the FW treatment is an attempt to redress the balance. Does it include Stormraven Gunships? (it's also an excuse to bring out 40k scale Thunderhawk heavy lifters transports, as if they needed one).