Is this product good for beginners or people who need to lose a lot of weight (300+ pounds, etc.)?

Yes, people at all fitness levels can use the GEAR 1 to reach their goals. GEAR 1 starts you off with an evaluation to see how fit you are. It then builds a personalized program suitable to your goals and fitness level. Since the training uses resistance rather than free weight, it adapts to your strength level, and can challenge even the most advanced users.