You may want to search the thread for more info but in general I haven't heard of people have success using the sidewinder in 4x4 SCT usage and I am not sure if castle even recommends it for that.

The MMP can be used but may need an external BEC and from what people have been saying it doesn't seem to deliver the power like the Tekin RX8. Some have also reported drops in temps when using the Tekin RX8 in comparison to the MMP. Considering the RX8 though was designed for 1/8 usage, not surprised lol.

Again, just what has been reported.

For me personally I have been using the Speed Passion GT2.0 Pro line of ESCs and it works great with the Tekin Pro4 motor I am using. A buddy of mine is using the newer Reventon Pro ESC which is even more powerful with success. For the money ($130ish for the Reventon Pro, $99 for the GT2.0 Pro), you get good bang for the buck.