I threw together a sweet cyclocross build last weekend. However it looks like the combination of XTR v-brakes and STI brake levers isn't the greatest combo. I don't get enough cable pull and thus don't have good brakes. Reading around online it looks like a common fix is to use a travel agent. If you've tried this did it work out ok? If not, whats the better solution?

This one looks like it could work:

QBP Product Reviews and Ratings - Brake Accessories - QBP Travel Agent from Performance Bike

Any other advice? Thanks!