Documentation is good and performance benchmarks prove it's a speedy upgrade.
Unfortunately, it may not be the best upgrade choice for all iMac users, given the high price. It couldn't have been more exciting when Newer Technology announced an upgrade for the original tray-loading iMac's processor. Up until then, things looked bleak, especially to experienced Mac users who have come to expect upgradable Macs. The bad news, unfortunately, is the price. Instead, it'll take some careful consideration to ensure that the upgrade is the right choice for you.