It's one of the best tail lights I've owned. It's really powerful. One of the best features I like about it is that it has a light sensor. so it turns bright when you are cycling through underpasses (which are very common in Bangalore). The battery life is pretty good. I don't need to charge the battery until 2-3 rides which is great.
There are tons of different modes and setting the right mode takes a little effort but once you've set the mode of your choice it remembers that setting and you don't really need to fiddle with it anymore. I would highly recommend this product.