I bought this one over the other water rower because of the adjustable resistance. Note that you adjust the resistance by adding more/less water to the tank - not using a knob or similar mechanical mechanism. This is easy to do using the hand-pump that comes with the rower.
The rower is of extremely high quality, and I'm not disappointed. It gives a great workout. This is my second rower - I previously had one of the cheaper piston ones, which I've outgrown.
This water rower is in a different league. Real smooth operation, with natural feeling resistance.
It's been manufactured to pretty tight tolerances - so it the frame feels solid and sturdy. The flipside of this is that some pieces are a bit difficult to fit together - just use a bit of patience, and maybe a tap or two with a rubber mallet. Other than that the assembly is straight forward.
Rower works great, though the assembly requires correction that is not documented in the manual. The magnet under the seat (to work with electronic monitor) was placed on the wrong side, and to correct this requires reassembling the seat and rollers with the spacers on the other side. The magnet was glued on the wrong side, and required some force to loosen. The water resistance works great. Quiet (only hear water swooshing noise) and smooth resistance.
The First Degree Fitness Neptune Rower utilizes water resistance to provide a great workout on the body. Rowing in your own home has never been as real until now, thanks to the Neptune rower by First Degree Fitness. The rower employs fluid resistance with a tough polycarbonate tank that holds 9 to 17 liters of water to provide a thorough resistance workout. An ergonomic handle, pivoting footboards and a super comfortable seat prevent strain on the body and make this water rower easy to use. This is the First Degree Fitness Fluid Neptune Rower