After having raced for the past 8 years, I just got a pair of Nordica Enforcers (last years' model, 99mm waist, 177cm, 19M, sandwich construction). I mostly ski in NH/VT/ME but wanted something that would do better in variable snow conditions and that I could take out West with me.
They carve shockingly well.
Are they as responsive as my Rossi World Cup SL/GS? No. Do I feel as confident laying them over on a steep, icy pitch? No. There is a bit of vagueness underfoot during the edge to edge transition.
But on hard surfaces, I can carve aggressive, high-speed arcs with confidence. I took them to Loon in late December with my SLs in the car just in case I wanted something more groomer-centric. Even though it was a hard pack day (albeit pretty grippy snow on most parts of the mountain), I had so much fun on the Enforcers that I left the SLs in the car. I feel like my racing background lends me enough credibility to say "yes, these absolutely carve".
If you're a dedicated, groomer/frontside-only skier, then I'd say stick to a narrow waist. But the modern reality is that some 80+ mm waist skis that are built with a fairly robust construction can definitely ski groomers very well, and give you more versatility across snow conditions. After all those years of skiing 60-something waist race stock skis, I figured I'd get something in the low-80mm width range for my all-mountain purchase and ended up on skis near 100mm!