After just finishing my build more or less I will add to the excellent comments by Battle_Axe and say this...
Tools: a 2mm hex driver is a must, Allen keys simply wont do for the whole job but are needed for some parts.
7mm and 5mm wrench drivers or a wrench multi-tool like you get with all Tamiya's..the kit does not come with one.
I have Fastrax Hex drivers and Ansmann Wrench both are excellent and very good value.
Small Phillips screwdriver. B&Q
Superglue for tyres.
The kit has diff grease and shock oil...Shocks come assembled so it's like having some spare.
I have run my Madrat with a 2000 NiMh and it's fine..of course wont get uber speed but it's still plenty quick.
The instructions for the Madrat are quite good, the servo saver needs some study... And to note, you will need to take off the front chassis upper plate to install the steering servo but this is no big deal.
I really had great fun building and hopping up my Rat and Can't wait to start on the X4 Pro in a few weeks
J