I use it and it's great. My phone 'accepted' the battery right away too. All I did was charge it fully while my phone was off, unplugged the charger and booted my phone. It's only double the amount of the mAh as compared to the stock battery, but it just seems to discharge a lot slower so it lasts way more than double the time until empty (in my experience so far at least). If you don't believe me, just read the reviews on Amazon:
Amazon.com: Customer Reviews: Laza Zcell 3460mah HTC Evo 3D Extended Battery + Cover
You can buy it from eBay for about $10 cheaper (after you consider all shipping costs, etc).