We did 135 with ejm for several years, there is pros and con. Great fuel prices throughtout the country,fleet insurance policy and flight safety discounts. Slow at paying for trips you flew and sometimes flew trips you didn't make money at. You will have to explain to your boss why you did such trips, gotta take the good with the bad. We are in the process of going on someone else's 135 we have been at it since December, the FAA is really backed up, we were given 12-14 months it could take. If we are lucky we will do the proving runs in October or November (25hours) Insurance requirements have really changed since 9/11 as everyone is aware of, so get ready. I agree the simpliest way is to go on someone elses certificate, just be ready for to deal with both sides of the fence.