I had 2 petrofs.
50 inch upright. I had it about a year. I then bought a Petrof 6'4. The upright was great. The grand however, did not hold up well under my practising. 2 or more hours a day pretty much did it in after about 3 years. I had to have serious action work done. ($1600) It was constantly needing to be vioced and tuned. During the 3rd year I had it, my tech came out (per my request) to take a look at some things that were bothering me. The repair quote was once again expensive. I simply wasn't interested in dumping any more money into a piano that wasn't ever going to be truly great. From what I understand, the next buyer had to spend $1000 getting it repaired before playing it.
So all in all. If you are a serious pianist and are going to be practising a lot, I would recomend something a bit more sturdy.