Yes I do. I have their V2 intake, their P1 tune in N mode, P2 tune in D mode, and a Remus axleback exhaust, so I'm an actual customer. I've never had any problems with the tune, and Toby has provided updates within hours every time I've had a factory update done. I've been using this for over a year, and there's definitely more than a 19hp difference between stock and the tune. I've had to reflash back to stock a couple of times for dealer service, and the difference between stock and the tune is quite noticeable. I don't know what your situation is, and since you're piecing together a car from salvage, that automatically takes it out of being normal. Toby has already mentioned that he's seeing a lot of variations in factory software just in the North America, so it's logical that Alfa is doing the same thing there in Europe. That makes it incredibly difficult to try and remotely (from the U.S.) sort out a situation such as yours where you are.
You really need to be asking these questions in a thread or forum where people are doing what you're doing. Maybe a racer forum for people who heavily modify their Alfas for racing.