The only problem I've ever heard of with a travel agent is where the cable has to wrap around and feed through the pulley. That configuration places a lot of stress on the cable and that is where most will break.

I had an old touring bike once that used travel agents...In my opinion there are better options. I purchased a set of dia-comp 287-V road brake levers. They are designed to be used with V-brakes without any adapters. Those worked great and were still on the bike when I sold it.

The second option is a set of V-brakes designed to be used with standard road levers. Off hand I don't have the brands or model numbers available to pass on to you, but I have seen them. A little time on Google should produce some answers.