RE: Diff setups
I have found the HPI drift tires give normal driving ability with drifting. You can either keep 4 wheels planted or accelerate fast to kick the rear out and do a controlled drift.
I imagine the ABS tires would give too little traction and many people lock 4 diffs and just gun it the whole time by sliding around.
I used a rear locked diff on my TL-01 and it handles like a scale RWD car with the HPI drift tires. I imagine with the front diff locked it will be too forgiving, but right now it's fun to drive and taked some skill to get a 20 foot drift going.