You're right about the 3.5-3.6 volts however I've seen some that can be fine sitting at 3.2 volts and not adapted at all, it seems to vary. My tuner said he thinks my problem is that the wastegate was binding which I had previously verified the same day I checked for boost leaks that it wasn't. All he's saying now is it's a hardware issue. I'll do the wiring the same time I do the turbo. Even if the wiring, the turbo or the wastgate isn't the cause (which would be a head scratcher) I can have piece of mind having a preset actuator and better engineered components. I've also been eyeing the TPC20BB which claims to test the actuator before they ship but nothing about an upgrade on the actuator itself. But, going that route and doing it myself I can have the ease of adjusting it off the car.
The lifetime warranty is great, that's the main reason why I bought it but I've read nothing but people having problems with the IHI wastegate during the cold months bending, the HPA is engineered to ensure that does not happen. Being from the northern region it made sense for me and to not have to replace the turbo every year, it would be worth it.