I'm growing Marquette and Petite Pearl. They both make decent wine, but the jury is still out as to how good. Right now with early tasting on 2016, I'd say I prefer Petite Pearl.
The biggest issue with Marquette is early bud break. If I had understood this when I planted, I might have only planted Petite Pearl. It's a real issue and one of these years a late frost is going to zap my whole crop. Petite Pearl breaks out about 10 days later than Marquette, even with double delayed pruning on the Marquette.
The Marquette also gets so high in sugar, therefore high in alcohol. I harvested last year at 28 brix. I watered back to 25.5 at fermentation, but I'll take it back even further this year, like 24. There is a presence of alcohol in the Marquette. I don't know if there is any way to fix that before I bottle.
I live in zone 5a, we hit -25F this winter, and everything looks alive. I don't have any issues with ripening as I get about 2700 GDD each year. This year I am experimenting with some Pinot Noir and Pinot Precose, which will require heavy winter protection, if they will survive at all.