I've got a hybrid hx50 from scheids on my truck. I was talking a few months ago about people saying the shafts are weak. Here's what I was told. Yes, the shafts break, but not because of them being a small or weak shaft. The front cover is cast fairly thin compared to other chargers. At high boost levels, the intake charge is actually warm enough to warp the compressor housing, causing contact with the compressor wheel, and snap goes the 50. BTW, I've run this charger for 2+ years at pressure levels of 60+. The only problem I had was a seal on the exhaust side. On a 24 valve, I like it much more than the gt4294 with the 1.15 t4 housing I tried this year.
andy