Your arguments aren't convincing, as to latest sonars, You failed to recognize Europeans are technologically advanced as Americans and even better in many aspects.
I just have to look at new generation of warships laid down by various nations in Europe, and I am afraid US sucks major way.
I know Astute has few issues, mainly with the reactor and some optronic and vectronic equipment, but these are being worked on as we speak, still, from what I know of Virginia class, they are belated with issues and financial problems akin to sea wolf class.
Not saying US submarines are bad, but they' aren't best, I won't go in to argument who's d**k is bigger, and than say we are allies and all, to be honest, I do not care if we are allies or not, the fact Americans are so ignorant, arrogant and self centered flag waving bunch of d*****ds makes this world unsafe, and other countries think less of America and Americans.
If Americans for second thought how others think and feel when you start flag waving and we are the best s**t you'd realize sometimes if you are best it is not worth barging about, others already know that; barging about it won't make you look better, contrary it will make you look stupid, ignorant and very unpopular. BTW America is not the best in many fields, it is rather pathetic in many fields to be honest, in many aspects US is a 3rd world country.
Just to tell you, French sonar that Astute is using has been tested and proved to be the best sonar in the world, now I am not going to publicize Thales and there sonars after all sonars do harm dolphins and whales, so I am not keen on use of sonars, but if we really have to talk about it, lets be reasonable and offer some prof as to what, who, why and when.
This post is not trying to be confrontational, on contrary it tries to convey a sentiment many of us feel, stop barging, and make sensible and constructive argument which will convince us all of your claims.
\V/ Live long and prosper.