The pre WW1 C. Bechsteins are among the very best pianos ever made. David Stanwood told me emphatically that these are his absolute favorite pianos ever.
IMO, the new C. Bechsteins have been redesigned away from the sound that established them as one of the great pianos. They have decided to take the same tactic that many makers try ( and fail at ) and incorporate many of Steinways design features into their pianos, and take on Steinway head on. This is a huge shame, as the world of pianos becomes more and more homogenized, and to lose the distinct C Bechstein sound is a real loss. August Forster, Bosendorfer, and Bluthner are the only old European companies that have maintained their sound from the past.
The old C Bechsteins are proof that the belly design is everything, and soundboard size is meaningless. These pianos have very little soundboard area that is active, yet they can have a quantity of sound that will blow your head off.
As to the plates, we have rebuilt many pre WWI C Bechsteins over the past 30 years, and only a couple had cracked plates. These were pianos that belonged to customers, and they were rebuilt with a clear explanation. The plates were repaired and reinforced, and are holding up wonderfully, and I have no concern about thier longevity. No warranty was given for the plate on these pianos, but if we were to see them now, and make the same repair, we would have no problem offering a full 10 year warranty for the plate. FWIW, we have seen more cracked plates from more recent pianos of a certain famous American piano maker, not Mason & Hamlin. These have been of the type we would not repair under any circumstances.
By the way, this is not an endorsement of buying pianos with cracked plates. Most of the time this means the piano should have a new plate, and this is so impractical that it makes the piano essentially worthless.
As to the actions, when we rebuild old C Bechsteins, we completely modernize the actions, and save very little from the original actions. The older actions can be made to work well enough, as can Bluthner patent actions, but our approach is that our rebuilds should dramatically out perform their new equivalents, or what is the point.
Iumonito, we have a C Bechstein B (6'9") from about 1910 totally rebuilt and for sale, and you are welcome to come and try it, and see what you think. We think it gives our new Steingraeber 205s a run for their money, as well as our rebuilt Steinways, which is the highest praise I can give a piano.
Rebuilding pre WWI German pianos ( and Austrian ) is much more difficult than American pianos from this same period, especially when you get into modernizing actions. So if anyone is considering a rebuilt C Bechstein, or other German or Austrian make from this period, you need to be much more careful than when considering an American rebuild ( which you still have to be super careful with since most rebuild work is very bad )