I owned a 2010 Can-Am RT for 3 years, and after many modifications, we loved it. Until it broke down and left us stranded 1000 miles from home. Had to ship it back to my dealer, who had just gotten in a GW with Lehman conversion. We were able to come to terms, and I now own a GW.<br />
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If you are looking at a new RT, they are very nice. My mechanical problem was unusual, and does not happen very often. We installed a Corbin seat, which was fantastic; also changed the shocks (the new ones are better than the 2010), and made some other mods. The RT was fun to ride, and comfortable. But, as others have said, the Rotex engine likes high revs, which I didn't like when travelling at highway speeds. It also has a small gas tank, and uses premium gas. I averaged about 29 mpg.
Also, check the maintenance cost on the Spyder, it is VERY expensive, much more than the Wing. $300 oil changes, 12000 mile service was $1200. Your dealer might be different, but the Spyder is a very expensive bike to have serviced.<br />
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The GW on the other hand is a much more comfortable bike for long distance travel. It has a very wide torque band, so it is much more relaxing to ride at highway speeds. It also has a larger gas tanks, uses regular, and I've been getting about 34 mpg.<br />
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I love the GW and would never go back to a Spyder. But, the Spyder was fun and had some great features. <br />
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Try them both, for as long a ride as possible.