I've been using the YONKFUL Pull Up Assistance Bands for a few months now, and they've become an essential part of my workout routine. The natural rubber material feels durable and doesn't have that weird chemical smell some resistance bands have. I especially appreciate how they maintain their elasticity even after repeated use.

The four different resistance levels (purple to orange) are perfect for progressive training. I started with the purple band when I could barely do one pull-up, and now I'm comfortably using the green one. The ability to combine bands is genius - when I want extra challenge during leg day, I stack two bands together for deeper squats.

What surprised me most was how versatile these bands are. Beyond pull-up assistance, I use them for stretching before runs, adding resistance to push-ups, and even for physical therapy exercises when my shoulder acts up. The included carry bag makes it easy to throw them in my backpack - they've come with me on business trips, to parks, and even on vacation.

That said, they're not perfect. Like some reviewers mentioned, the heaviest band might not provide enough assistance if you're already doing multiple unassisted pull-ups. And while mine haven't snapped yet (knock on wood), I do inspect them regularly for wear after hearing others' experiences.

For beginners or intermediate fitness enthusiasts looking for portable resistance training options, these bands offer great value. Just temper your expectations if you're already at an advanced level - you might need heavier resistance than what this set provides.