It's a muscle relaxant, and a GABA agonist, that lasts around two to three hours. Effectively, it's useful for sedation, pain relief, muscle relaxation, and relief of anxiety. If you're using it to get high, I would expect something fairly benzo-like, but all the usual warnings about addiction to (and withdrawal from) drugs that bang on GABA apply. Similarly, it potentiates the fuck out of opiates (which makes it really useful for helping modulate pain from skeletal muscle convulsions, but means you need to be really careful combining those two things because of the massively elevated risk of fatal respiratory depression and aspiration of vomit).