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Nef
Fucked around with map 1 on the JB4 (+2 psi over stock) and that was obviously not worth it, so jumped straight to map 4 (sets boost target to 20psi). Driving sensibly, you can't tell any difference to be honest. With it being a 2.0, you can keep up with traffic around town without even really using boost. Onto the M11 and I honestly couldn't feel much difference, it did feel like it pulled through the higher rev range rather than tailing off above 4-5k rpm, and the app confirmed it was boosting to 20psi consistently. On the way home I had one opportunity to go full throttle in 2nd gear through to 4th and it was then it felt noticeably quicker.
I'm a little disappointed that the "butt dyno" isn't reading an extra 70bhp, but I think the Volvo's turbo lag and then big hit has spoiled me for a long time.
If you own a petrol VAG car and fancy some extra power, I would take this feedback as a strong selling point, the JB4 has supposedly added 25% power and maintained OEM feeling/smoothness.