I still have my folding Polaroid 340 which dates from about 1976 and this is my favourite. I like the rangefinder which does enable you to get the photos well focussed. Even back in the 80's when I used it quite a lot, I was very pleased with the Polacolor prints that I got. They've been stored in the dark (in the filmpack box) and have not faded or shifted colour balance.
It is a pain that these cameras take the PX19 or type 531 battery. But this appears to still be manufactured, at least by Exell. It can be obtained in the UK from the Small Battery Company www.smallbattery.company.org.uk They're in stock but not cheap. The batteries have a shelf life of several years.