All I can say about the tt-01d is don't waste your money on all of the aluminium & carbon fibre upgrades. I got one off a guy who spent a small fortune who was gutted to find it didn't hold its value. Also had the XB Coppermix Silvia & didn't notice much difference once balanced with added weights. I had no idea how rubbish this model was until I got something much better but are glad I learnt with the Tamiya first.