Look at the pay. Please find somewhere better to go..
Pay is not the most important thing in the world. If it was I would have stayed in the aviation recruiting business making between 12k to 60k a month working a 50 hours a week Monday thru Friday (yes, that is what one makes in thst industry!). But happiness was not found in all the material things I earned in that business. And I also learned how quick you can lose all those material things through divorce, auto accidents, medical leaves, economy changes, loss of motivation, etc (some of that loss experienced by me first hand and other loss experienced by friends where I observed).
If money drives you in flying, have a job for you. It is flying medical flights in San Antonio where you will make over 75k and upward of 80k your first year. And get yearly raises. Pay is great for a King Air. But expect a poor quality of life as you will work 5 to 6 days a week minimum. Have no benefits other than expensive healthcare (no holidays ever, no vacation until after year one, no workers comp if hurt on the job, etc). You will not be treated like a professional since you are a disposable piece of crap to management and it is proven by a stack of resumes on their desk of your replacement (it will be shown to you if you need 'put back in line'). And you will be promised the world verbally, yet never see any changes. But hey. It pays great!
So for me, Quality of Life is most important. Then a company that is presently growing and appears stable long term given their present business plans. Then third is pay. So why Mesa?
QOL: houston base means I can drive there from San Antonio once on the line. And reserve appears to be a short stint. So they meet the QOL criteria since Houston is the only base the is a reasonable drive (3.5 hours).
STABLE: well no regional is stable. But a growing fleet with a future fleet plan is the only criteria that to me makes sense in deciding if regional A is better than regional B. Mesa has a growing fleet plan. So criteria two met.
PAY: yes. Mesa pay and benefits are the worst. I know this. I would easily make 10k more at PSA which is the absolute best place to be in my opinion as they have good QOL and good pay (great pay if you utilize the SAP properly) compared to other regionals. But their bases mean commuting by air. And commuting by air is best avoided out of SAT from past experience.