I have tested my T34 ( Taigen lower hull) on couple surfaces ,
1. On concrete surface....fine.
2. On grass ....there are some slippery when turning but I 've learned how to minimize it..
3. On dirt ..nearly same result as on the grass.
4. On mud ... not test yet.
5.On snow....no snow in Thailand.
After couple months of playing... no major problems found.