Safer than the Lutron outlets IMO.To keep things cheap, my plan is to wire a European outlet right above my normal outlets. Then I only have to put Euro plugs on the lamps I am plugging in. Sure it won't meet code, but no one that I know of carries a converter in their pocket so it should keep any stupid mistakes from happening. Being a completely different plug I think is a better solution than the $30 Lutron ones that someone could force something else to work on.
Good luck with that. While it may seem like a acceptable solution the codes are there for a reason.
Cheaper maybe. Safer... who knows. The whole idea around the lutron plug is that you can't plug in a standard plug due to the little bump. Seems pretty fool proof to me.
Also, I would never install something that is not UL rated as a means of electrical distribution in my home. Others may be willing to take that risk.
If you ever move, just don't forget to take them out.