Weber's mid price range Genesis series is one of the most popular gas grills in the USA. The line was totally redesigned as Genesis II with a soft launch at the end of 2016 and a full roll out for Spring 2017. Consumer response was disappointing so Weber redesigned the line again for 2019.
Many expressed concern that Genesis production has moved from the USA to China. The warranty has changed, but it's a mixed bag. Housings dropped from 25 years to 10 years, however the grates and flavorizer bars went up from 5 years for stainless steel to 10 years, and 3/2 years for porcelain coated enameled grates and bars respectively to 5 years for both. The new Infinity Ignition "Ensured to ignite every time with improved durability and enhanced 10 year warranty", is up from 2 years. Electronic components have been a major source of pain for grill manufacturers and consumers alike. High priced luxury producers have been able to use state of the art durable parts, while mass market brands had to use lower quality, less reliable parts to keep prices in line for shoppers in big box stores. That seems to be changing with component pricing going down and performance heading north.
The previous Genesis models were all 3-burners, Genesis II is offered in 3 and 4 burner configurations.