Terrible. I canceled my trip, actually didn't want to cancel just change the dates. Couldn't make it as there was no such option, so I had no choice but cancel it, however got voucher for next trip. Wanted to use it immediately but after trying few times I gave up, as there was no option of typing in any vouchers while booking!!! In few days I tried again as I needed to book a trip to Poland. Obviously my voucher was not valid anymore and I had to pay again!! Great! This is how flix bus earns money? Congrats!! I wish 'polskibus' still existed. I had been using polskibus for years before, and never had such problems. Then it was sold to flixbus, sadly. It's just cheating on people. I'm shocked and angry. Not to mention the internet never works inside.