I am not an Amado style water key fan. I have seen other players have problems (for whatever reason) during performances over the years. With the standard type key even if a spring or cork should fail in a performance easy fixes are there for immediate remedy to get through the gig.
I purchased a wonderful Bach C Cornet 238 bell that someone had put Amado keys on and the first thing I did was have them replaced with standard lever style keys.
Couldn't be happier.
Bottom line is "to each his/her own!"