They are a no-frills carrier.
Be careful regarding things like luggage - depending on your fare 1 checked bag may be included or can cost 520 pesos extra. Sometimes the fare that comes with the bag included costs only 100 pesos more.
If you want to choose a seat, it will probably cost extra. If you check in at the airport rather than at home, it will cost extra.
I have had some spectacular delays with them, but I have heard of no Flybondi-esque stories safety-wise. And they’ve been here for double as long.
As long as you know exactly what you’re getting, and the timing is not mission critical, you could do worse.