I did 30 minutes on a concept2 yesterday. I liked it, especially for the back workout. I was a little disappointed in the legs though. I did my best to work my legs as hard as I could, but they didn't get any sort of burn like I had expected. Not bad, but not great.
I started playing hockey a few years ago and that has come along really well. However, this past year, playing hockey to stay in hockey shape hasn't worked and my endurance is getting progressively worse. It's pitiful right now, so I need to do something to get back to where I can put some quality shifts in from start to finish. I'm worried that the rowing won't hit my legs enough.