The service from the DS factory is Alan at 132slotcar.us. He has parts. They are after all a European mfg while the rest are US companies. I've had mine quite a while and the only issue I have seen is once when the trigger got sticky and wouldn't return all the way. Thought at the moment I had lost the brake circuit but no. So I haven't lost a brake circuit yet but neither do I use mine much with vintage 1:24 cars with old-style motors.
However I have run Enduro's of 50 minute heats using Scale Auto and BRM 1:24's with no issue at all.
They are also the only controller I know of with adjustable trigger tension.
It's quite possible they are not really rated for those motors hence the problem with the brake circuits
I find them an excellent controller for 1:32.
And I will say this, it's the fastest off the line controller I have ever had and I usually take off first in just about every heat. Always nice to be in the lead for at least a few feet. 
