I bought some csl reps from Mark and although I was very happy with the service and turnaround in getting them,the wheels that I ordered,which were chrome faced,diamond cut have corroded very badly over the space of a short few months.
Before they were put onto the car,I coated them in Autoglym wheel protection and have since used Poorboys,with no slow down in the corrosion.
They will be refurbished as soon as I replace the rear tyres or put my winters on.
As a dealer,I would highly recommend BM Autosport.However,I would be wary of the longevity of some of the finishes...
In fairness,oem wheels have their own issues with them cracking-I found my rear MV3's both had hairline cracks,so get what you like.Buying reps has no stigma attached and might mean that you can get some decent rubber in the deal.