QUOTE(another crazy pianist @ Jan 23 2006, 11:18 PM)

New Petrofs have a wonderful, romantic timbre, but be warned : this beautiful sound could get harsh and metallic sooner than with Yamaha, and the quality of it's action is not quite as durable. If you can find a Yamaha that you like from the beginning, it's probably a better investment.
Either you like it or you don't. There is nothing wrong with these 2 pianos. They are both fine instrument.
Every piano gets brighter when it aged. Reason is because the felt compresses and harden over time. When this happens, get a tech to voice it down. It is not difficult if the tech knows what he/she is doing. I think it is the opposite, Yamaha sound brighter and metallic sooner. Again, it all depends to environment and how often it is played. If piano A is played 2 hours a day and piano B is played 8 hours a day, piano B sure to get brighter/louder sooner than A.
Durable? If you refering to the Pe131, it uses full renner action. I wonder why great builders are using it on their grands or uprights, if it not durable. Infact, Renner is one of finest action maker in the world. Uses hornbean wood, a dense wood that is strong. (www.rennerusa.com). Detoa action (I think is Czech Action) was used on other Petrof models. A tech told me that it just needed some extra work to before it feel nice. In the recent years Petrof have switch to Petrof/Renner action on certain models of their uprights and grands. (something about Renner Parts on Petrof Frame). It is better and smoother. I read in other forum they did some test on Detoa, Langer and Renner. All these 3 actions were regulated and the result was non of the pianists find any different between these 3. All played well.
There is no good return investment for piano if you decide to sell it in future. Any piano will depreciate. What is important is that you should buy a piano because you like the tone and the touch. Good tone & touch will give you the best return investment.
Regards.