I have both and personally I like the Power Zone goggles better as both are the same price. Some of the positive aspects of these goggles compared to the E Force: The Power Zone feels a bit more solid and also much more comfortable on my head than the E Force. The Power Zones also have a small foam strip on top of the goggles to keep sweat out of my eyes, which is a big key for me. I also prefer the Power Zone strap setup, where the Power Force strap is integrated into the earcups and wraps a pair of rubber E Force around them. I also like the neoprene E-Force strap, but this advantage is negated by the restricted range of motion of the Velcro. Power Zones use a slip system so you have a lot more room to adjust the strap. Both pairs have adjustable ear tips that can be adjusted to the shape of your head. One of the benefits of the E Force is that for those who are very picky about the shape of their glasses, the E Force comes with a few different nose pieces. For me, that's not critical as the Power Zones are much more comfortable on my head. I have used both and love both pairs but to me the Power Zones are a much better pair of goggles for a similarly priced product. Highly recommended!
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