It's very stable. Kudos to the manufacturer! My sons loves it. Way different compare to the one he's using at the gym. He stated that the flat bench that he used to use at the gym is about to fall into pieces, screws starting loosing and getting out of shape. This flat bench I bought for him is very stable. He's impressed!
I have been using this unit at our gym for over a year, then bought my own. Only three exercises, one of which does the same thing as a Roman Chair, which is crucial for the lower back; it is called Hyper Extension. If you cannot do this for your lower back, those discs will get worst than they are. If you cannot do this at least twice a week, skip it.
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