Bunion correction usually gives good results and satisfaction rates. As one of the causes for bunions are usually about 90% genetic, we will always quote a risk of recurrence of about 5-10%.
This does not depend on what technique is done, whether it is open or keyhole. So again, the important point to note is: if the results are the same between an open or keyhole correction, why would one not choose a technique that has less pain, less risks of infection and bleeding, and is cosmetically much more pleasing.