99.5% necessary accessory for any bug/bus owner. They need non-trivial tuning about every 3k-5k to keep them running well order compared to what we have today. The lifters need adjusting, fuel filter replacement, etc. about as often as most people get an oil change.

They don't have A/C. The heat carries with it exhaust stink and is nearly useless anywhere northeast or midwest. They rust easy, are very unsafe by today's standards, hydroplane like mad (though rear-wheel-drive is fun), and the motors on the wipers either creep slowly or sweep slowly. They are light and tall, so they are like sails when you have cross winds. They can barely maintain speed up long ascents...

But that book is an amazing piece of craft.