If you're talking about the SPM 1600 Voltage protector, that's used in a few instances. It's reccomend if you have a BEC that has a lower output or at times if you're running 4-cell. I use on in my Mini LST with a Tekin Brushless and it cleared up the BEC issues I was having. That is the only vehicle I run the Voltage Protector in, and I run my Spektrum receivers in my:
Sportwerks Mayhem ST
Tabushi, I had a 3PDF a few years ago. If memory serves, everything the 3PDF had, the DX3 has feature wise, plus it's Spektrum!
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