I think I have the lone Power Puck on TDR.
My first one had problems, but the new one and all the new one way non-interupter units are working fine. They now come with a built in boost module.
I am running the Puck and DD3's as my only fueling modifications on my ETH. I have towed with it and it works very well... . Last time on the dyno (Diesel Thunder) I cranked out 370. 3 HP.
The Puck, EZ, and VA units do the same thing... it comes down to one thing IMO when choosing between them... . price!