Castle Creations CC Bec Pro 20A 12S Switching Regulator

This is better than expected. I use it for non-RC applications that require about half the rated capacity of this. I have found it to be incredibly stable under test and in service. It is more stable than a power supply that I could make, and VERY efficient. I use this for an on-body, battery powered device, that uses about 200ma standby and 10a peak. Even at standby there is very little loss (something like 10% or less if I recall... it's been a while). I use it at 5v with 11-16v in. You will need (or at least WANT) a castle link, so just get it at same time. Castle link requires Windows AFAIK.

Great product for bigger RC planes, programmable piece of mind to take the stress off your ESC. Lots of power to spare even on my Corsair with 13 servos

This is a fine BEC from a respected American company. It puts out a large amount of current and in my 550-size heli this unit hardly even breaks a sweat. You can set the voltage using the Castle Link. If you buy a Castle speed controller there is usually a coupon for a free one. An important point is that you must disconnect the Link if you are trying to measure the output voltage you have set. If you leave it connected while bench testing you will only measure about 4 volts on the output. This is true no matter what voltage you select. This is not a real problem, just something to be aware of to avoid going around in circles while setting things up. Castle really should mention this in their documentation or their web site.

Works fine. You will probably need the programmer as well, which is another $30-$40. This should probably be sold in combination with the programmer, as a combined deal.

As advertised top-notch item