I recently had some spare cash so I wanted to get my bora mapped. I had a choice of derv tech, darkside and shark.
I emailed all 3 companies and received replys from them. They all seemed legit but it took darkside a long time where as the other 2 where within hours.
Darkside won't map your car if it has hardware from another company on it, this didn't suit me as I was going to fit a turborevs intercooler so they were out the window. I then asked derv tech who seemed friendly enough but everything appeared to be based on guess work. It also turned out that a colleague had their software on his fabia, it smoked, like f*ck even with the cat in place and his turbo had taken a beating due to the map. He has since got rid. This put me right off.
This left me with shark and I'm really happy with the map. Buckets of power, wiped the floor with a fiesta St the other day off the lights and the mpg has never been so high. There's also NO smoke and I'm running a decat and egr delete (free with the software).
The quotes I got were as follows:
derv tech 250
darkside 300
shark 250