I have one, I picked one up after the good recomendations from this site, and being new too all this I was worried about buying the right gear.
I replaced a burnt out SPX with it and find its great.
Would reccomend buying the digital programming box and upgrading the the latest software too though, The box was about £12 from Giant shark If I remeber rightly.
Obviously It will depend on what you are running motor and scale etc. but I find it doesn't get warm even with the bost turned up (1/10 offroad and 8.5 motor 2wd).
Although I usually have the boost and timing turned right down on "newb mode" so I dont crash so often.