It's an awesome combo. While doug is kind of right about going into benzo blackouts, they usually only happen if you've combined a lot of benzos with a lot of alcohol. Small doses, and without combining with other GABAs, can work very nicely with weed. Makes it a lot more chilled out, can increase the high a lot, as well as getting rid of any paranoia. 0.5mg is a fairly small dose, but it should be enough for this purpose. A mistake people often make is taking more because they don't 'feel' anything off it (and then taking even more because of the amnesia making you forget how much you've actually taken), but benzo effects can be very subtle.