I used to fly for them and they also fly C-402 in addition to the types mentioned by Capt Obvious. The MU-2's were parked a few years back and they have begun painting the E-110's. Thankfully 64DA is no longer in its original paint (or lack thereof).
It is a pager lifesyle. You will get a small guarantee. The guarantees were running 300-500 a week depending on seat and acft type. You are then paid by the mile. e.g. an E110 is paid 300 a week. You aren't paid anything until you break 3000 miles in the week. The lears FO's get about 400 a week and about 4 cents a mile.
Expect to only get about 4-6 days off a month and be tied to a pager. They have 45 min response time. Which means they get the plane in the air in 45 minutes or less so you will need to live within 20 minutes of PTK.
Kirt is the Owner/DO and Ron is CP. Both are good guys and do a lot of the training, themselves. They also had great healthcare when I was there and I don't think they changed as they were grandfathered into an awesome plane. You pay for it, but it rocks.