Olaf,
I bought them a long time ago but never paint them. I need a Sherman platoon for scenario so I . Nevertheless, when I will really begin to work on a US Force, I will switch to 1/56 tank ( BAM or AGNM ) for the WW Sherman are a bit small. I don't have this issue with the T34s or Panthers.
About the quality, I would say that it's not the quality you have now from BAM, AGNM, BG or Chieftain. Two are nice, two are average and one is quite badly cast. However the assembly is rather easy.
Olivier