First of all, I'd like to mention that I've owned by Cruzer Micro for about 2 years - I only have the 2GB version but thought I'd review on here seeing as this is an awesome price for a high quality memory stick.
Ever since getting this bit of kit its worked a treat, despite being plastic, its VERY durable. By being plastic, its also VERY light, I've many times thought I may have lost it, as its so small and light in my pocket! Not sure if thats a good thing!
Also, the USB slider feature is very good - one would think that the slider may get a bit flimsy and loose after much use, but this is not the case, its still as tightly locked and good to use as the first day I got it.
And beleive me, I got this about half way through my college course and it got very vigorous and rough use - being slapped in and out of many machines - and it has never been a problem.
It has always been attached to my key ring along with many other keys and the small metal key ring attached to the stick is still in one peice - I think because it is metal, and so small - it is actually stronger than it looks.
When the USB section is snugly tucked away, it is still exposed to air, but its concealed enough to be safe, and what harm is a little dust going to do, I've NEVER once had to blow dust out of the end of mine and it still works first time every time.
One thing I'd also like to mention is that someone mentioned if you google "sandisk cruzer doesn't work" then you get lots of hits... most of these hits are about problems with the U3 technology and on various models of memory stick.
I never really used the U3 features so can't comment on that.
Hope this helps.
5/5 for sure.