Its often not the tuners that cause tuning instability and, if you know how to wrap the string, its very unlikely the tuners are the issue. The most likely cause is the nut and I think most people seem to be confusing locking tuners with locking nuts. The biggest advantage of locking tuners is quicker/easier string changes.
I am sure you probably knew all that anyway but in case others don't, its useful information. If people are struggling with tuning stability, its better to look at how you have wrapped the strings and/or lubed the nut - that generally fixes any issue - in fact changing the nut itself, a cheaper option, generally fixes and tuning instability.
I am not going to say these are a 'pointless' upgrade to the regular tuners as I would want locking tuners myself - if only for the quicker, easier string changes. All my guitars have locking tuners (unsurprisingly) and its great that PRS are now offering these as an option. Its one of the most requested upgrade question in the forums - which locking tuners should they buy. Now there us a very easy answer that's guaranteed to fit....