I researched the pack longevity before I purchased my Escape Hybrid. The pack is designed to outlast the vehicle. The other issues that come up with most hybrids can be dealt with rather inexpensively if you know what you're looking for, and you're moderately handy. Early on, Hybrid batteries died quick. Now, it is quite rare for a hybrid battery to die an untimely death. There's Ford Escape Hybrids out there in taxi fleets with over 300,000 miles, and one FEH owned by a security company has over 500,000 miles on the original battery pack. Low mileage used packs are available for about $1,200. The only late model hybrids that don't seem to last are the Hondas. They're having constant problems with packs dying before 100,000 miles. They had a firmware update that was supposed to fix this. After the update, the vehicle's mileage goes down, and the battery pack needs to get a lot worse before the trouble light comes on, so when a customer comes in with battery problems now, the dealer tells them that the light isn't on, its fine.