Was the guy an instructor? talk to somebody else you may get the opposite view, each to there own,
I have owned a flexwing for around 3 years now its an older 2 stroke 2nd generation type and I love it but it can be frustrating at times,
The up to date ones are a different kettle of fish, but yes they can be a handful on the ground if its windy, my limit to rig up is around 12mph, and taxi 20mph but I am newish to the sport,
Have a trail flight in one and a chat with the instructor,
The school that is based at the field where I fly has both flex/fixed.
http://www.wlms.co.uk/
Nick.