Over the weekend I managed to destroy the internal mechanism of my 26 year old Concept 2 model B rowing machine. The unit has been excellent - a very smooth motion and one of the few exercise machines I've ever used that is good enough that I've stuck with it. These seem to be the gold standard for rowing training and are used in many college and Olympic training programs.
There have been design improvements over the years, but not enough to make you want to trade in unless you are very serious. Support over the years has been excellent and there has never been any pressure to sell a new unit. Once I asked about that and the guy on the other end said they'd be happy if their users got 50 years out of a machine, but were so happy they sold a few friends on the idea. I know I've helped them sell four over the years, so it must work.
Anyway fast efficient help trying to sort out what is needed today. A great company with a great product and support.
Rowing turns out to be an excellent aerobic exercise that hits a lot of muscles. Try one out at a health club if you are looking for an all-around aerobic machine. It might suit your style and some people get into competition on the machines rather than on the water.
Here is their website.