We have a Bowflex and the young men here love it for exercise.
Does not take up too much space, folds up to small when not in use.
The reps are smooth because of the power rod resistence.
Goes from 5 lbs to 105 lbs / per side/ with a variety of exercises for the entire body.
Well built.
Good for teens because it is not possible to drop a heavy weight on yourself......ie like a bench press and drop the weight on your chest.
We give it high 5's.
(In another thread, I had mistyped soloflex. We have a Bowflex.)