I've used the SiZzix system for years, but for scrapbooking. I have since gone digital, so I don't have mine anymore, but I did wonder if the Accuquilt dies would be compatible.
The ad says they are.
The quality of the machine is high. It weighs a "ton" and gives consistent cuts. The dies are safe to use because the cutting edge is hidden inside the thick foam of the die. Their dies are made for paper, so I don't know how they'd hold up cutting fabric.
The company that makes Sizzix, is one that backs their products.
IMHO.