I had written a hands-on review on my blog, since (even though I ordered and received this mouse from Amazon), I was unable to review on this mouse since it was incorrectly categorized as "Preorder" for quite some time.
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First of all, here are the "pros" of the mouse:
* It has a LOT of buttons
* It glows and has shiny colors
* It looks expensive, and has a little WoW logo on the plastic, as well as a WoW-skinned software UI.
Here are the cons:
* It utilizes delays, loops, and timers and ENCOURAGES users to leave the delays on by default. This is against the WoW Terms of Use and can get your account banned. If you manually turn them off and know what you're doing, you'll be fine.
* The "macro system" is just insertion of keys into the keyboard buffer. That means if you want to "stopattack" a mob that just got sheeped or CC'ed, the keys will "collide" with any other keys you're typing at the time (including your "wasd" movement keys) and will type them directly into the in-game chat buffer. (see video) This is the exact same macro functionality as any other macro-capable non-WoW mouse.
* Names with extended ASCII characters are not recognized by the macro software. That means those with extended ASCII or from non-US locales won't be able to utilize the armory feature within the software.
* The software does not come shipped in the box. If you do not have the internet for some ungodly reason and plan on using this mouse on an offline PC game, you are out of luck.
The "not good, not bad" parts:
* The mouse (at least IMHO) is uncomfortable for those with small hands. I am a female gamer with small hands (5'2", 100 lbs) -- extended play sessions are not possible with this mouse since it is designed for a larger hand.
For more details, feel free to visit my blog post review or view the video. I've gotten a few not-so-friendly comments somewhat along the lines of "LOL N00B. Only a dumb girl would fat-finger mouse buttons while they're chatting lolz pwnt!". Of course, since I don't expect every video commenter on youtube to possess an IQ, I'll politely point out that the video is what's called an "example", and that the real-world scenarios (/stopattacking a sheep, /assisting another character, whatnot) would collide with your movement keys (wasd, q and e) providing you with a command much like "/stopatwwwwwack" or "/assqqqqqqissssssst"
As a 15-button mouse, you're not going to find anything like it on the market right now. If you're unconcerned with the built-in macro functionality, feel free to utilize this mouse with single-character keybindings (i.e. "f" as an in-game keybinding for assist instead of "/assist"). However, as the feature-rich designed-for-World-of-Warcraft mouse that was touted with such specially co-designed features, I'm astonished that the macro system is identical to other mice on the market, and that the mouse's user guide would recommend breaking the WoW's terms of use.
It gets 2 stars for misleading advertising, continually pushed preorder dates that continued even after I received my 2-month preorder, and the lack of "designed-for-WoW" functional and non-cosmetic features.
As a 15-button mouse, it gets 3 stars -- I hear it fails at keybinding key combinations (such as CTRL+5 or SHIFT+4), but the multitude of buttons might still be appealing. If steelseries had marketed this mouse as a general gaming mouse, they'd have had none of the problems with false advertising and might've gotten a bigger market since I don't know many MMO gamers who need 15-button mice.
EDIT: April 27, 2010
I noticed a new button under the main menu->Interface options that mentions "Detect Steelseries WoW Mouse"... it may be that FINALLY, WoW had added the advertised special functionality that was advertised for us a year ago who paid far too much to sit on a ridiculously long waiting list for something that didn't even work as advertised.... So MAYBE this actually works correctly now. I wouldn't know - I haven't used the Steelseries mouse since this review, nor would I (since it's not comfortable, so perhaps someone with the current WoW patch and this mouse could write an updated review regarding the macro issue.
However, there are also new mice on the market, like the Razer Naga, that include a LOT of bindable buttons in a much more comfortable form (at least, in my opinion). So do your market research and decide whether you really want to throw money at a company (Steelseries) that has treated its customers to a poor quality mouse with both hardware and software issues, poor ergonomics, and unreliable release dates/pre-order handling.
I'm likely to buy a Razer Naga in the near future, but in the meanwhile, I've already given away my Steelseries mouse to my boyfriend since his mouse broke and he just needed a basic point-and-click device... you know, a basic mouse. And yes, he's a main tank for the highest progression guild on our server - and while he could use as many bindable keys as he can get, I don't think he's even using any of the hard-to-reach keys on this Steelseries mouse.
Best of luck!
-Jennifer