Here's my 'official' review.
Size: Although at first glance and from what pictures you may have seen online, the iPod mini seems "not that much smaller" than the current iPod. In reality, it is not really that much smaller! But, the 3G iPod is small as it is, that the iPod mini being even smaller, makes it unreasonably small, yet still insanely functional. Stand an iPod mini up to a mini DV tape, and you'll be impressed.
Actual Feel: The difference between the original iPod and the mini in terms of weight alone is reason enough for runners to buy it. I used to run with the original iPod and if I would try to put it in my pocket, it would either pull my pants down or swing dangerously. The ladies would like me to keep on using the original iPod, but he mini is better for those of us who are self conscious about our manhood, among other things. By placing the iPod mini on your arm for running with the optional armband, you wont know its there. It is an incredible feeling to be running and hearing music, but not even have a constant reminder from the source itself, that the music is being played from it. It is like weightless music. I took the mini to school with me, with no case. I just dropped it into my jean's pocket and off I went. Hardly any noticeable weight, and nearly zero bulk.
Construction/Design: The mini is really well protected in its aluminum shell, it has picked up no scratches or blemishes of any kind to its body. The only concern I have, is that the scroll whell is prone to getting dirty, because I must have had pencil lead on my finger, which rubbed onto the scroll wheel. I rubbed off the mark in time, so it didnt stain, but it is something to be careful about. Wash your hands before using the mini! I havent dropped it yet, thank god. I hope I never do, but I feel confident that if I did accidentally happen to fumble the mini, it is made out of a resilient grade aluminum and it wouldnt break.
Price/Value: Obviously, this is the most touchy of all of the subjects surrounding the iPod mini. For me, there is no question that the price was well worth it for the product. I am able to go running with the iPod mini now, and not have to worry about dropping it or switching the hands that hold it as I run. It can slip into my pocket and it wont pick up scratches or blemishes. Maybe the only thing I miss is being able to covertly check out my hair in the reflective mirror of the old iPod. As many people may say, the difference of 11 GB's just wont allow them to spend $50 less. For those people it is understandable that they would feel like that. If I were not as active and on-the-go as I am, I would not buy an iPod mini.
Conclusion: So far the experience I have had with the mini really outdoes my original iPod experience. I am not able to carry as many songs, but I also only listen to so many. Portability may come at a slight premium but as far as Apple's players go, the most portable one is the least expensive option. I would encourage anyone to go see it for themselves to get an idea of the fit and finish, that Apple is famous for, and the mini is no exception to Ive's wonderous design skills. I truely believe this iPod mini is going to be the reason why Apple retains its lead in digital music, now and into the foreseeable future.