05-09 mustang automatic transmission reliability? (5r55s)

Maybe unpopular opinion but I like the older s197 body style better. Also l’ve owned 2 v6 mustangs now and wanted to get a v8 (coyote is slightly out of my budget…) I guess I downgraded a bit interior wise but since they’re about the same mileage I’d say I came out on top since I sold the 11 v6 for 10k and I’ll have some leftover money to work on this build