It looks like WizzAir might help get out of a pickle that Delta has put me in

. I know this is a super "no-frills" airline, which is OK, but I will have 2 small pieces of luggage, one that could qualify as standard placed-in-the-bin carry-on, and one that is a bookbag that I could fit under the seat in front of me. I've done this in the past - especially to get around waiting for my luggage to clear after arriving at the "border" airport in the USA, to then go on my final connection leg, so that a late flight does not cause me to miss that connection

- but with airlines always announcing at the gate that "room is tight", I've just been checking that non-bookbag bag since I get a free check-in bag for international flights.
So my question is how does WizzAir handle this? I have this sinking feeling that they nickel & dime everyone. And with the low flight loads, there should be no problem with carry-on baggage space.
I should say that the flight I am referring to is LED-LTN.