since I'm poor and won't spend $500 on an air impact, i had no choice than to go to corded. my brother was doing his front struts on his 2006 altima and was having a hard time removing bolts due to being rusty and really torqued down. if we had an impact, he wouldn't have had such a hard time. since that corded one i bought has a large back end and the room isn't all that great, those extensions and swivels would have been the first choice. sure its not the safest, but its better than busting knuckles trying to break a bolt free with a ratchet. i see where you're coming from, but aren't they ok if the extensions or swivels are lightly used, like once or very quickly? how often does something like that break or "explode"