I have also tried that, drawbacks i encountered were the fumes were toxic and i didn't want that in my garage.
hydrogen and oxygen are not toxic, just very flammable, but you dont have to worry about a fire hazard unless its in a sealed container because so little is produced. unless you put table salt in your water then you could make chlorine gas which is bad stuff.
2 H2O + -e = 2 H2 gas + O2 gas
2 NaCl + -e = 2 Na + Cl2 gas
the sodium reacts with water instantly resulting in sodium hydroxide ( not a ignition source for the H2 )
