I've listened to both WoK and WoR on Graphic Audio.
These are essentially told like the radio plays of earlier decades.
I will say that the characters when I read the books now have the GA voices.
I think Dalinar and Syl are done perfectly, I actually enjoyed The Lopen, reminded on Michael Pena's character from 'Ant-Man'.
I wasn't impressed by Navani who I think sounded too much like an old lady rather than the strong, Alethi matriarch she is in the books.
Special mention to the Narrator, Dylan Lynch, he does the job perfectly.
*** Small spoilers for WoK and WoR below ***
Chapter: He who Saves in WoR
To hear Syl actually screaming at Kaladin and the Stormfather, then to suffer along with Kaladin and hear him speak the third Oath through tears and pain.
It sends chills through you. I cannot recommend the Graphic Audio versions of these books enough.
For me I've read WoK and WoR 3 times each and listened to the GA of both twice. I find the GA best for when multi-tasking as I already know the story and can listen with half an ear as it were.
I do think the prices are a little high, however, you are paying for over a hundred hours of audio and voice actors time. I assume the background ambient sounds are all stock audio.