I was running the GTB in it but as you said the fan won't clear the body so I cut one out to fit it. (never thought to take the fan off
DUH) There are a ton of guys running the Sphere and it does seem good but I love the new sensorless technology as I already have the Mamba Max in my 1/10 pan car and it is great (albeit a little big for 1/12 scale) but it says 6 cells and up (now that I've heard it will run 4 I might just try it
). The new Tekin looks like a great option for 1/12 though small footprint, light weight and I love having less wires (no sensor wires). That or the New Orion/GM but it is hard to find any specs on (that aren't in German).
It just seems to me that sensorless is the next evolution of the brushless and I want to try it out.