I used to drive around on semi's all day and every day.
they are legal for on the road as far as i'm aware, as they are dot approved,
in the wet, it was often hard to lose traction in a 450hp gtr And in the dry... forget about spinning your wheels anywhere, even 7000rpm launches all you got was stick.
Now the bad points,
They will be alot harder on your drivetran, you could possibly even break things, your diff is going to get a worn out alot quicker and the tyres themselves dont quiet last that long..
this was bridgestone re55s or similar.