I am very close to buying a Concept2 because it is supposed to be the best rowing machine on the market. However, I am nervous about completing the purchase. I am not a rower, but I have enjoyed using rowing machines in the past at the gym. Since I am not a rower, do I need a Concept2? Would a cheaper and/or smaller machine be fine? Is there a specific less expensive option that you recommend? Or, is Concept2 definitely worth the money? Will I regret getting a less expensive machine?