I have tried multiples with my wife. Ranging from only slightly larger to making me 9x7. It seems she wasn’t completely thrilled with them even though she was able to orgasm with the smallest of them. The largest she said hurt her. She said they felt too fake and preferred the feeling of the real thing.
I have also tried a huge range of dildos with her and her favorite is actually one that is smaller than me in length and girth. She said the thicker ones do feel good but don’t necessarily hit the spots that she likes.
I would still recommend trying them. It is fun putting then on and swinging a big beefy unit around! My favorites were the fantasy xtensions. Get the 1 inch bigger standard girth and maybe the 1 inch extra girth. If she likes them, move up to the 2 or 3 inch ones and the girth she likes.