I lived in an apartment with voltages swinging 120 to 130V. Technically still OK, but it made me a little nervous.
Doing regulation requires a lot of iron, so, they are a very expensive feature which most people don't need, so I'd say you are fine without it.
Doing regulation requires a lot of iron, so, they are a very expensive feature which most people don't need, so I'd say you are fine without it.