Breguet 3657

Thanks to a fellow Purist I had the chance to acquire a pure classic which belongs to every decent watch collection imho: A Breguet Tourbillon. I like tourbillo

i'm looking for reviews on these 2 models. can anyone point me to where i can find any? thanks

Great confusion about real size of 3657. Some dealers told me firstly was made in a 39 mm case and actual production is 40 mm. Others told me was only made in 3

I really like the look/feel of this one, how much can I expect to pay for it?

5357, 3657, or the new 5307 with a self-winding movement. Thanks for your input.