The grinder attachments / plates are all stainless steel. I made sure I did my research there
The vac sealer description also states that "The machine is compatible with any size of vacuum sealer bags or rolls which are the best quality channelled/embossed bag and rolls on the market today." I'm using the rolls, so I can cut them to the sizes I require. They're not cheap, but they look to be exceedingly robust.
The missus has been talking about getting a KitchenAid for a while, but they seem so overpriced to me I couldn't justify it. The grinding attachment costs more than the complete mincer + attachment set I bought, and has far worse reviews!
Thanks for the weschenfelder tip though - It's always good to have another sausage related store to peruse