So whats best generic or custom?
It all depends on what you want from your car mate and how far you are going to take it (performance wise).
Custom remaps are tailored not only to your modifications, but how your car performs with those modifications and runs in general. A custom remap from a reputable outfit will make sure all the parts of your car (performance mods) are working together as well as they possibly can both in terms of performance and reliability.
A generic file will still see results but may not achieve the best results possible unless your car happens to be identical to the car the generic map file was developed on. Unlikely.
In my experience a lot of the custom maps out there are sometimes cheaper than generic files!
I live North of Aberdeen and have taken 2 of my own cars to R-Tech for a custom remap and would have no hesitation taking a 3rd when the time comes.
I realise however that this isn't practical for everybody and there are also other tuners out there (whoI'm sure R-Tech can recommend), who can also offer an impressive level of service.