Getting harder to support, since they are not being made and have not been made in a while. I think some operators may have actually bought Mojave airframes for parts.
I found it to be a pretty reliable aircraft, just getting a bit long in the tooth. The SAS - Stability Augmentation System (Cheyenne, I and II) can be troublesome.
Engines start temping out around 21k feet
Not as roomy as a C90, but probably a bit faster, than at least the C90 and C90a
They have a pretty good range, I routinely did 4-5 hour flights. Also took one to the Azores from St Johns, NFLD.