I would never invest in a isolation booth for my home - I would prefer having a separate studio to do my work in. I don't record much at home anyway, i don't perform, and most of the performers I know do not live near my home, hence the separate studio in the city.
That SE Reflection Filter is great, we have it at our studio. We have a little bit of bleed coming from the control room as the sound proofing isn't done fully, so we just point the back to the reflection filter to the door and cuts all noise out (unless the speakers are at stupidly high levels). Worth getting one of them