We only sell button machines with a fixed size (dies). This is a conscious choice. They work fast, are compact and everything stays firmly (and in proper calibration).
The price and quality of button machines is mainly determined by the dies. Cheaper devices work either much more slowly (attaching accessories between the dies or removing them per intermediate step) or economise on choice of material. That is why these are less durable and will wear out faster or the ease of use / speed is much lower.
There are exchangeable button machines with high quality dies, but they cost nearly a multifold of our separate devices with a fixed size of quality dies. An additional advantage is that the fixed devices can be used side by side at the same time. No parts can be lost and everything remains nicely calibrated.
That's why we happily give a 3 year warranty without a doubt!