advantages:
-you may meet a lot of interesting and kind people
-it should be very poor to travell like that
-I think that it`s more comfortable than in the long-distance buses
disadvanteges:
-you may meet a very cruel or person or just a murderer or somebody like him
-it should be very poor to travell like that but I prefer to pay money and to travell with some comfort in a train or in a plane
-I suppose that if during your travelling something would break (for example,a car) nobody will help you but if you have ordered a ticket in a company which deals with travellings, you may hope for help or to demand your money back