I use this belt to train for endurance in my backyard pool. I hook it around a piece of furniture and swim for 30 minute blocks at a time without ever having to do a flip turn. I''ve used all four strokes with it and the only thing the cord slightly inhibits is breaststroke legs, but only marginally.
I am not a veteran swimmer, so the medium weight resistance works perfectly. If you wanted to power strokes and have the strength you may want to go with heavy weight size.
I highly recommend this product for limited space training or just overall fitness :)

It's too hot to do much here but swim.  I attached it to the side of my Intex pool and swim in place.   Which is much more tiring than swimming laps.

Great item for what I was looking to do which is swim in my back yard pool for the summer without leaving home.  I use the rope hooks inside my pool and just bought a clip to clip it onto the bar instead of looping it every time.  Does make you work hard!