If the plane has pillows grab one or two on the way in - you'll need it to sit on. Poor suckers that use the pillows after me...
The ride is nice, but the seats are hard. Of course, most airplane seats are unnecessarily hard these days it seems. I think the only ones I really like are Airbus seats.
Since it's a Mesa flight you might want to prepare yourself for the potential of less than stellar service... good luck!!!