We have an 8 year old DR S97 which my Son road races with an X30 on it. It's getting a little tired. Doesn't quite adjust as well as it use to. Meaning you have to go further with adjustments to see the same change.
We also have 2 Margay Ignites (2 and 3 years old), which we also road race in the CIK 206 class. They may be fine until a better chassis design comes along. A 206s 9 HP certainly won't wear them out!
In our experience, less HP classes don't wear out chassis' very fast. But you do need to stay with the times, so to speak. If something much better comes along, get one.
In the high HP sprint racing classes, like shifters (40+HP) and Tags (32ish HP) you may need to get a new chassis every year to stay competitive at the highest levels (like SKUSA). Local racing not so often.
As for your Margay. It should be fine with a 206 on it for quite some time. Or until a better mouse trap comes along.
Others results may vary,
Clark Gaynor Sr.