We have flown via Midwest Express Airlines five times now. Always as a connecting flight.
The planes are smaller, the rows are set up as one seat on one side and two seats on the other. So you have pretty good odds at getting a window seat. :)
Midwest Express has run on time for us for all our flights. The flight attendants are courteous and pleasant. Snacks are good too.
The planes are newer, very clean, and user friendly. The bathrooms are typical.
Flights via Midwest Express are considerably lower in cost than the other major airline companies.
They recently expanded their flight services also.
I highly recommend.