I work at a Petrof dealer and I have had quite a bit of experience working on Petrof verticals, which I find to be very well made. I like the fact that the verticals have agraffes all the way up to C8. The 50" vertical and all the grands have Renner actions. Another tech at the store works on the grands, so unfortunately I have less direct experience with them, but I have had the opportunity to tune (and play) many of the grands, and I find them a joy to work on. Tom Sivak
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