Let's get something out of the way right now - you are not buying a high quality watch tool kit for $10, so make sure you have realistic expectations.  Bergeon watch tools are considered to be among the best but you will pay, for example, $17 for the resizing block, $10 for each mini screwdriver, $220 for a case back wrench, etc.  As another reviewer mentioned, you're saving money with this kit if you resize even 2-3 watch bracelets - a local watch shop, as another example, charges $5 for resizing, not to mention the cost and hassle of getting there.  So far, I've resized at least 3 watch bracelets and the tools are intact and like-new.  In my experience, the first things to break when using cheap watch tools are the pin end of the spring bar tool or the pins used for the resizing block.  This takes a moderate amount of effort or mishandling, though.  Be careful about how hard you're pressing the pins - if they won't budge, proceed at your own peril.  Avoid tilting the pins on angles that will bend them, too - they won't hold up.

Frankly, all cheap watch tools are the same to me - mass-produced in China using low-quality materials.  So, unless you're willing to pay big bucks or are a watchmaker who requires high-quality tools, stick with the cheap stuff and replace it as it breaks.  Some may say that you end up spending more by replacing low quality tools than springing for the high quality counterparts - the Bergeon case back wrench I mentioned earlier, JUST THE WRENCH, is worth 10 of these cheapo kits.  It seems unlikely, in my opinion, that you'll render 10 kits totally unusable.  If you do, maybe you should be paying someone else to perform the work on your watches, anyway.