Let me start by saying I was skeptical about this abs stimulator at first. I mean, can you really get toned muscles just by strapping on a belt? But after using the MarCoolTrip MZ for several weeks, I'm pleasantly surprised!

The Good Stuff:

• The 6 different modes (fat burning, sit-ups, massage etc.) actually feel different - it's not just marketing fluff. The fat burning mode gives this intense pulsing sensation while the massage mode is surprisingly relaxing after a long day.

• I love using it while watching TV or working at my desk. It's like getting a workout while being productive (or lazy). After about 2 weeks of consistent use (15 mins twice daily), I noticed my stomach feeling tighter when I flex.

• The build quality is solid - no cheap plasticky feel here. The electrodes stick well with just a bit of water (comes with a handy spray bottle).

The Not-So-Good:

• As a size medium woman, the belt is WAY too big. I have to hold it in place with my hands during use which defeats the hands-free purpose. The arm bands are comically large too - they'd probably only fit bodybuilders.

• Don't expect miracles - this won't replace actual exercise and diet. But as a supplement to your fitness routine? Absolutely helpful for that extra definition.

Real Talk:

The tingling sensation takes some getting used to - start at level 1! By week 3 at level 8, I actually felt that satisfying post-workout muscle soreness in my core. My husband noticed my posture improved too since the device makes you more aware of engaging your core muscles.

Final Verdict: 4/5 stars. Great for toning but sizing issues knock off a point. If you're petite, look for a smaller alternative or be prepared to MacGyver the fit.