I still use the Silhouette--a lot! I'm on a Mac, with older Adobe software (Creative Suite 2) which the Silhouette supports directly. The BlackCat software does not, so I am going through the .svg conversion of files, then through Sure Cuts A Lot (SCAL) software. When I just want to scribe stuff, like ribs on a surface, or have outlines that I can scribe and then snap, the Silhouette is better. But when I have to cut clear through 0.5 mm (.020") styrene, then it's the BlackCat. I'm told the BlackCat will cut through .040 styrene, and might try that with Plastruct ribbed stock soon.
The BlackCat is a BIG machine compared to the Silhouette. But styrene is not the easiest stuff to cut clear through, as it tends to spring up and foul the cutter. I'll be using bigger doses of sticky (repositional adhesive?) in the future.
The BlackCat is not for the faint of heart when cutting heavy stuff. But then, what else will cut it, esecially at $750?