The hidden fees cropping up are like your enemy showing up at your party, nasty surprise. These fees should be transparent, they don't even show in "estimated total" (esp. mandatory insurance as any sane person knows how insurance is a great way to take your money for nothing) I've wasted time researching on this app what wasn't in fact a competitive option. I finally used them once but will not use them again. The owner and the car were great however.