We have had Caresource Silver and Caresource Bronze plans. In our local area (Summit County, OH) there are plenty of in network providers but I always call a new provider and double check because the online provider website is not always up to date.
As for processing claims, they have been very good. I find the negotiated rates (also called allowed amount) to be very good. Claims are processed promptly. If there is a problem with a claim the Explanation Of Benefits will tell you that you don't have to do anything further, they will handle it.
Here's an example of their very reasonable negotiated rates. I had an MRI. The billed amount was $5,966. The negotiated rate is $248. They didn’t pay anything, the bill gets an adjustment/discount. I have not met the deductible so I pay $248.
If you want to keep your providers check with them and see if they take Caresource. Be specific that it's a Caresource MARKETPLACE plan (used to be called Just4Me) because there are also Caresource Medicare and Caresource Medicaid.