I’ve got the VSi-640 and love it, can’t really speak for the other one as never used it but the VSi is a nice machine.
In terms of printing I couldn’t ask for more, in terms of cutting it’s not been great but then that could be me.
I’ve got a little trouble with contour cuts, small things it’s perfect, anything over a metre and it’s way off, did a van the other day and it was shocking, re-printed it with a massive bleed and came out fine, there is some settings i need to go through but not had time yet.