The original version of my JB Signature Line parallel charge board was ALMOST perfect. But I found a few ways to make it better. I've improved the layout so that it's easier to plug in balance plugs, and I've added polyfuses to protect the board when you plug in a balance plug wrong. And it's still cheaper (per port) than any other board you could buy.
I'm confident saying that this is THE BEST parallel charge board you can buy for charging 4S batteries.