Just food for thought... and IMHO.... I personally buy a vehicle primarily focused on the "heart" of the vehicle - the engine. I don't care about anything else because if the engine is crap, you basically have nothing. My 2001 LeSabre has one of the best engines GM ever produced (3800 series) and this is widely accepted by mechanics that know engines. There's no way I would touch this new Buick as I've had experience with family and friends that have purchased both Encores and Chevy Cruse models with these new modern turbo four cylinders. All of them became very good friends with their prospective warranty and service directors.Cars last longer now than ever before and the average age of vehicles on the road continues to climb.
There are very few "unreliable" cars IMO.
No reason to think the Buick wouldn't last as long as you want it to.
Car have become more reliable for sure...but not all. the Japanese brands still hold the title and out of those... one or two are at the top. AS for these newer GM offerings.... Not a long term solution. Are they attractive? Sure. Marriage material? Nope. More like a one-night stand.