The rowing machine is my tool of choice for gym cardio now. It has so much range. You can get a high intensity workout in 5 minutes, or slow the pace and go for 40.
The only drawback is that it's hard to go for long sessions regularly because it's tough on the hands, at least in my experience.
I also find it a good one for mid-lifers like me who find ellipticals increasingly boring. I just go for longer sessions on the rower now, usually between 5 and 10 kms.
Once upon a time long ago, I could do 2000m in 6:52. Now I could maybe pull off 7:20. But I might die first, so just stick with endurance mostly.
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