The capacity isn't the issue for me, its the lack of stability.They are inexpensive (compared to floor jack), compact and have a high capacity.
Houses with foundations aren't on wheels....The guys doing foundation repairs jacking houses and stuff up use them a lot around here.
Seeing what happened to someone's legs that were under a car when the jack failed taught me this lesson. Hearing a grown man screaming is not a sound you ever forget.Agree on jackstands...never work under a vehicle supported only on a jack.