willinwrote a review of Wahoo Fitness KICKR CORE Smart Power Trainer on December 3, 2018
Familiarity: I've put it through the wringer
Bottom line: Wahoo delivers a good product, and if not, they take care of you.
I used the Core for about a month and had numerous problems immediately out of the box. First there were loud knocking sounds. Also, when using Zwift I had a hard time drafting other riders and the fine control of resistance seemed to be lacking.
I opened up the belt cover and discovered that the main pulley that attaches the belt to the lower drive shaft was loose. I tightened the set screw and things improved for a while.
Then, the resistance unit and its axle literally slid laterally off the frame making the trainer inoperable. I tried fixing but I was worried it would slide all the way off and careen through my house like a wrecking ball of pure kinetic energy.
As you can understand, it's disappointing to buy a 900-dollar trainer and have it fall apart on you after a dozen rides...
Fortunately, I contacted Wahoo and they quickly responded. I determined that the unit I received was not assembled properly at the factory. The main bolt that keeps the axle attached to the frame was not installed. All that was holding the ~200rpm resistance unit on the frame was the friction of a 2mm set screw. Yeesh.
Wahoo offered to send me a replacement via 2nd day air, free of charge.
The new unit is very quiet--the drivetrain noise is more than the trainer itself---and the resistance control is greatly enhanced on Zwift--drafting works now and those 15% hills feel like they're supposed to... ouch. It's a great trainer that will make riding fun all Winter.