Legal yes... recommended? No... not if you have kids or tend to do silly things while inebriated.
Those suckers are amazing... will absolutely super heat most objects to the point of ignition! Including your fingers so watch out!
Not really a light saber... since physics does not allow for a beam of energy to terminate AND remain... but it looks like one and has a beam that is visible in all but bright lighting and WILL burn sh*t!
F'n cool... dangerous but cool