I probably should explain my choice of radio and speedy, I find the Hitec transmitter to be one of the easiest to set up for tank style motor control. Normally most radios above 2 channel have one stick without a spring for aircraft throttle whereas I prefer to have both sticks return to centre for a boat model, so far the hitec optic 5 and 6 are the only ones I know of that already have the spring and arm in place so you only have to remove the ratchet thing and undo the spring tension.....easy no extra parts no trying to swap arms and springs.
As for the speedy, I sold a lot of these when I had my shop and never had an issue, I run them in my own boats and have found the amp rating to be correct, also they are an absolute pleasure to program using the separate programmer (following the beeps without the programmer is a pain with any brand )