My best piece of advice: STAY AWAY. There is not one good thing, starting from actual work completed, customer service, or reliability. I rang to enquire and was met with a direct quote saying 'send it, pay for postage, we'll sort it', no interest in the actual issue, and all of it over text, because no one ever picks up the phone. Anyway, they ignored several of my texts/calls when I was trying to get more info on progress and what would happen if the unit didn't work after their 'repair', but got nothing; when it came to payment though, they pestered my mechanic every 20 mins with texts. Anyway, unsurprisingly the issue came back immediately after install of the unit, to which I called, no answer, texted, eventually someone called me and was very rude saying it was my issue, and clearly I had misdiagnosed - I have had three very experienced mechanics tell me the ECU was the issue; when I tried to explain that, the guy just cut me off, said 'get your mechanic to call me'. Apparently they requested the unit to be sent back so they can send another - but I was unhappy with the outcome, because what is the guarantee, especially after dodgy communication and no diagnosis on their behalf? So I asked what the process was for a refund - they refused to call me, started sending rude text messages, basically the worst service I have ever had. All in all, there is no process for complaint, no process for refund, it was not clear anywhere whether or not there was any guarantee the work would be done... And on top of all of that, I had to ask to be sent an invoice, so clearly that is also not usual practice. Avoid at all costs, not worth the hassle.