It's great and head shops are starting to carry the equipment needed to smoke the oil, the one downside to BHO is the fact you have to buy new equipment as the BHO cannot just be put on some bud, well you can, but it's wasting it. Here's Wikipedia's definition of BHO and I have included a video on how one makes the BHO.
Hash oil is a resinous matrix of cannabinoids produced by a solvent extraction of cannabis. Hash oil is a concentrated product with a high THC content, which generally varies between 40% and 90%. Related honey oil is a specific type of hash oil made from the more potent parts of the cannabis plant. Hash oil is traditionally a dark, viscous liquid.