As US expats living in Mexico, we travel to/from the US and have used Volaris a number of times. Overall the service has been fine -- when you consider that even the "leading US airlines" have lowered the level of service they provide. Compared with their terrible service, Volaris doesn't seem so bad.
However the Volaris.com website is absolutely HORRENDOUSLY designed, wastes an enormous amount of customer's time and uses its confusing design to add charges. Advice: If booking online, WRITE DOWN the price you're quoted and if it is suddenly higher, step back to find where Volaris had you add insurance when you didn't intend to take it, or some other charge. Buyer beware!!!!
Why does this review form not include rating the airlines WEBSITE???? Volaris would get the lowest evaluation score possible.