Let me start by saying this ab trainer surprised me with its versatility. I've been using it for 3 weeks now, and my core has never felt tighter. The 4 adjustable resistance levels (though some users debate this - more on that later) let me scale from beginner to intense workouts seamlessly.

The automatic rebound feature is a game-changer. As someone with lower back sensitivity, the smooth assist during sit-ups prevents strain while still delivering a killer burn. I love doing bicycle crunches on this - the angled arm positions hit my obliques perfectly.

Now for the reality check: One user pointed out they couldn't find actual resistance adjustment mechanisms. After inspecting mine closely, I confirm there's no dial or knob to modify spring tension. However, changing the arm angles DOES alter when resistance engages in your movement, which creates different intensity effects.

The comfort features shine - that extra-thick seat cushion makes floor exercises bearable (goodbye tailbone pain!), and the foam handles stay grippy even when I'm sweaty. At 12 lbs, I literally carry it from bedroom to balcony for outdoor workouts.

Storage is brilliant - folds flat enough to slide under my bed, though the arms don't lock in folded position (minor annoyance). For push-ups, I agree with another reviewer that positioning feels awkward - it digs into my ribs unless I place it very carefully.

Final verdict? If you want serious ab engagement without gym equipment bulk, this delivers. Just temper expectations about 'adjustable resistance' meaning traditional weight settings. The rebound assist alone makes it worth it for core-focused routines!