Are you a lefty? If not, an ambi safey is more of a liability than an asset (IMHO).
Of the 1911s that I have owned, one came with an ambi sfety. While carrying it IWB (right handed) the thumb safety was repeatedly wiped off by getting into/out of my vehicle (a friend experienced the same issue). Not a problem
per se but not a good thing either. Changing to a traditional single side safety solved that.
The next 1911 with an ambi safety had the two sides become sloppy very quickly (the connection between the two sides developed some slop). Again, I had it replaced with an Ed Brown single sided safety.
The third time I bought a 1911 with an ambi safety, I did not wait for a problem...just had it swapped out.
See a pattern?