I had a chance to try out Bril Royal Blue thanks to Vaibhav Mehandiratta's generous giveaway last year. I found the ink to be a gentle shade of blue that behaved wonderfully well in all the pens I tried. The ink does just what you'd want: flows nicely, doesn't feather, drys pretty quickly and shades well with broader nibs. In short, it is a pleasure to use.
On copier paper, it's tough to distinguish from Waterman Serenity Blue. In a TSWBI notebook, the ink drys to a lighter shade of blue. For me, the color is rather subdued and careful and would be fine for work or school. It's not waterproof but doesn't disappear completely when doused.
As far as I can tell, Bril inks are not available outside India - but who knows, that could change. At Rs. 20 per 60ml bottle on the Bril estore, they have the advantage of being very affordable.