You can see from the above that it is critical to both shop around and consider all charges especially the ones buried in the small print. See Secret 10 - Remember - you're in the driving seat - which is one of this site's 10 Secrets to Good Personal Finance.
Personally, I wouldn't sign any equity release deal unless the provider breaks down every charge in detail for me. I would also visit a number of different providers. Only by doing this can you start to compare like with like.
Be aware of how these charges are paid. When and how will the total amount of charges have to be paid? Often you're given the choice to pay costs upfront or have them added to the overall loan.
If they are added to the total loan the amount will be paid over several years with interest charged on top. So where possible it's always better to pay the fees up front but this many be impossible for some people.