I have owned a Hellfire..... And I would not recommend getting one unless your getting it for dirt cheap, as in under $100.00 dirt cheap......Today you can buy a used Mugen MBX5T for $200.00, so unless the Hellfire is a pile cheaper its not worth buying.....
The Mugen is a all around better truck in every single aspect, its much more durable, it performs way better, its built with a much higher standard of quality, from metal quality to plastic quality.... I found the Hellfire to less durable then a Savage and I find a Mugen to be way more durable then a Savage..... If i was buying used today I would aim much higher then a Hellfire, IMO Hellfires are rather fragile when compared to the newer higher end machines like the Mugen.... for bashing a Mugen will give you everything you ask for and then some, the Hellfire on the other hand is going to give you lots of wrench time ! Unless the Hellfire is nearly free I would not touch it !