Sooo....all installed, 20mins total of which 15 was fafing around with harness, how to position etc.
1. Engine cover off
2. 2nd cover off
3. Unplug both sensors - i took of oil cap to have easier access to fuel sensor
4. Plug harness in as per manual (harnesses for both sensors clearly marked)
5. Fuel sensor needs to be tucked in under engine oil entry, otherwise you won't be able to put engine cover back on
6. Boost sensor then just on top of intake
7. Place box wherever suits you. I want to put it in little 'storage' under windshield on passenger side (as suggested here), but it was very tight fit and dont think you can lead harness there neatly. Didn't have much time, so for now sits in top of shock mount, zipp tied.
8. Ignition on, no error msges on dashboard, job done.
Box comes set on program 4. Initially left it at that. Quick trip around the block and... you can definitely feel the difference straight away. revs go up much easier and quicker, its just more linear to going up. Is it faster at that point? For sure, but not by much.
On way back set it up at highest program, 7. Yup, there's a bigger difference for sure. Revs go up even quicker and i can definitely say car feels quicker from the start
First impressions? Definitely worth getting it, if not for top horses and more fun, then for nice smoother ride alone is still worth it.
Mpg? Jury is out, but lets be honest, it won't get better at highest setting

Will test few programs for weeks worth of commute (30miles one way, town, trafic lights, a roads, dual line carriages), so will be able to say more then.
All in all, I'm happy with the purchase as 238horsies are better than180