I needed a tool like this to cut a square opening in my siding without removing any shingles. I thought it would be a one-time use tool so I did not want to spend a whole lot of money. I figured for the price I could not go wrong even if the tool broke after a few uses. I was not expecting much for the money. Well, it arrived and I was surprised at how robust the tool was. The head is made of cast material - not plastic like the Dremel. It did its job efficiently. It did not come with a case so I bought a plastic case at Lowes for $5.00.
I have now used this tool to replace a window (made cutting the sills an easy job); replace molding around interior doors; cutting the opening for a porch light, and more projects to come. My thoughts on one-time use have definitely changed.
You pay almost as much for just the replacement blades for the Bosch or Dremel tools. I have already gotten my monies worth. If you are a professional, I cannot attest to the durability of this product. If you are a DIY type individual then this is money well spent for the occasional use. What the heck, if you buy two (one as a back-up) you still end up paying less than a comparable competitor's brand.