I completely support T18's comments above.
The Sidewinder is a fine design and a superb aircraft if treated with respect.
It is not a kit, only plans are available, but if constructed with care it is a strong and well-performing aeroplane.
In my opinion the poor reputation is unfounded; I've read all the available NTSB accident files for this design and have not seen any reports that the aircraft came apart in flight. Virtually all cause factors relate to handling errors in some way or other.
I have accumulated just over 500 hours and 800+ flights in my Sidewinder over the past six years and find it a total pleasure to fly.