I've been skiing with the Sin 7 for about a year now, and I can say that it's a great option for people who are going to be dealing primarily with soft snow. I've used it on everything from hard packed early season groomers to knee-deep powder days, and definitely prefer the latter. It rips hard on groomers, just expect some chatter if they're icy, steep, and you're moving fast. They tend to chatter more in those conditions if you're not making perfect turns, which can be hard when you're trying to regulate your speed on steep groomers. On mellow to steep-ish Colorado groomers with soft snow I couldn't have asked for a better ski, especially given how they perform in the powder.
98mm seems like it might not be up for deep snow, but the huge rocker on this ski really helps out. Just yesterday I was up to my waist with this thing and while a wider ski would have had a more targeted performance in those conditions, I didn't have a problem floating and slashing and having a ton of fun. Basically if you're not trying to shell out for a separate pow ski and groomer ski I would say this is a great option. Bit bumpy in some cases but performs a lot better in powder than you might expect.