The Petrof factory buys Renner action parts and puts them together on the smaller grands. On the 6'4" grand you can buy either a complete Renner action, (the M model) or an action with Renner parts. The larger grand all have complete Renner actions. I have only been selling the Petrofs for a couple of months, but have had tremendous success with them Just about every piano player who has tried them liked them. Several customers like them better than Yamaha. The new Petrofs are much better than those of just a year or two ago, and they are getting better all the time, much to Alan Vincent's efforts. I would like to recommend you get one.
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