Ive been using this since the eariest releases and the review (below) was one I left a while ago. It is an MUST have. Do yourself a favour and get the version stright from the dev and pay for the PowerPack.
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I dont use any other app as much as Alfred. I just looked at my usage stats and I average slightly over 1,000 times a month which is mostly weekdays which puts it at about 50 times a day. It turns multiple keystrokes/clicks into two or three keystrokes with no mousing (big time saver), helps me find files and folders quickly, launch apps and scripts and I cant say enough about the support on the few occasions Ive had a question. It can do a lot more than I use it for and I slowly add scripts as the need arises, either self-written or downloaded.
Winstonsmith about Alfred, v1.2