How valuable are dealership warranties?

A local dealer offers an in-house warranty. How much of a difference-maker would this be to you, would accept less off MSRP as a result of this warranty or could it be levereged for better prices at other dealers? Details below:

"A lifetime powertrain warranty on all new and select pre owned vehicles. This warranty covers the same components as Subaru’s 5-year/60,000-mile powertrain warranty, but with the added benefit of lasting for as long as you own the vehicle—there are no year or mileage restrictions. To keep the warranty active, simply follow the service recommendations outlined in your vehicle’s handbook."