I've used Vallejo acrylic paints for a while, but these powdered pigments are a recent find - they're worth every penny!
The Supertest has thrown up some fantastic products, some of which I hadn't tried before, such as Vallejo Pigments and washes from MIG and Pro-Modeller. Most of these were discovered when reading through various military and aviation modelling magazines that I take monthly. Having a passing interest in these other disciplines keeps me up to date with other techniques, tools and materials that can be translated for railway use. If you're interested, I recommend the following titles: AFV and AIR Modeller (bi-monthly), Scale Aviation Modelling and Scale Aircraft Modelling.
Although there's not that many different shades available, these MIG stain washes are great fun to use.