Andy 5 This seller is very honest and very quick.I had a problem with the unit but they immediately helped to fix it.I really appreciated their super quick help.The price was also very good.I tried today, for the first time.I was a bit worried about inverting but it was fine.The table balances your weight gently.It definitely helped my back. I've had a lumber disk problem for about one month.I went to the chiropractor but that didn't help. Maybe even worse...I thought, I'd try this and it has worked!!I think I need to try it for a week or so but for now, my back seems realigned.So happy.My only recommendation is NOT to use this after eating or drinking.I was excited to try it after it arrived today and I had just eaten breakfast... I felt a bit sick... ; oTonight, I tried again and I was fine.I guess this unit would also be good for people who want to do muscle training, with vertical pull ups.I definitely recommend this seller!!Thank you so much.