RG Live WotLK 3.3.5a

http://adw.max-media.de/index.php?topic=725.0

Proc rate is PPM based, with an estimated chance of 2 PPM per talent point.

http://wow.allakhazam.com/forum.html?forum=243&mid=12246062888439750

Right now maelstrom weapon works as a ppm type mechanic. The value has been reported as about 10ppm.

http://wow.joystiq.com/2008/11/20/totem-talk-dragonblight-and-azjol-nerub/

You're right, it's 10 ppm no matter what your weapon speed is. However that's 10 ppm on white damage attacks, giving the slow weapons a higher percentage chance to proc per hit.

http://www.mmo-champion.com/threads/683420-Maelstrom-weapon

It is 10 ppm rate, however it is calculated as a percentage chance on the weapon landing - slower weapons = higher chance so that the speed evens out to 10ppm at base speed. Hasted obviously ups that rate.

http://wow.allakhazam.com/forum.html?forum=243&mid=1248986566308769731

Taken from Elitist Jerks.

Quote:
Maelstrom Weapon is a PPM talent that will reduce the cast time of a spell 100% at 5 stacks. At 5 points in the talent the proc has been resolved to 10 PPM. With fewer talent points invested the PPM will lower by an estimated 2 PPM per point.
http://z4.invisionfree.com/Sylvanas/index.php?showtopic=147
Other thing I noted was that 5 pt Maelstrom proc rate is 10 ppm, but seems blizz normalized it for a 2 hander, and 2 slow 1 handers can actualy make it proc seemingly a lot more than 10 ppm.

http://webcache.googleusercontent.com/search?q=cache:flbhxmBjRW4J:www.shalillszorn.de/forum/viewtopic.php%3Ff%3D78%26t%3D1552+&cd=2&hl=de&ct=clnk&gl=de

Maelstrom-Waffe (oder Waffe des Maelstrom, ka wie die deutsche übersetzung ist) ist ein PPM (procs-per-minute) Talent, welches die Castzeit eines Zaubers bei 5 Stacks um 100% verringert. Bei 5/5 Talentpunkten hat sich eine Procrate von 10 PPM herauskristallisiert. Mit weniger Punkten in dem Talent verringert sich die Procchance um ~2PPM pro Talentpunkt.

Rawr spricht sich ebenfalls für 10 aus:

float mwPPM = 2 * _talents.MaelstromWeapon * (1 + _stats.Enhance4T8 * 0.2f);

Simcraft ebenfalls:

double chance = a -> weapon -> proc_chance_on_swing( p -> talents.maelstrom_weapon * 2.0 );

Bei uns ist auf Rang 5 jedoch 12 eingetragen.

PPMs wie sie sein sollten laut den Quellen:

51528 2
51529 4
51530 6
51531 8
51532 10