I was with CIS/Progressive for a very long time, they were the first that I worked with in this business, and I liked working with them.
True, they have the best marketing on this website, but, overall they do not have the best coverage and rates for all straight trucks in expediting, and they will say that as well.
All this depends on your driving record, qualifications, type of vehicle(s), and location, just to name a few factors, (I have a perfect driving record, a CDL, and with no tickets or accidents or claims).
With that said, CIS/Progressive is the best for most, but not for all in this business, (based on my 40 years experience in business with the last 15 years in this business).
If their insurance is the best that you can find, then great, more power to you, nothing wrong with that, that's your business, not mine, just saying.