I maidened a Hot Stik two weeks ago in 15 mph with gusts to 25. Not by real choice but I was determined (and the club was out for our Chili fly and needed something/someone to critique). It's only a problem when you get near the ground. ;-)

I'd say 20 mph steady and I'm out. What can be done vs. what is fun are two different things. I've been flying and had wind storms pipe up and have had to fight them in. What you don't want to do then is try to wait it out and end up having to deadstick into strong headwinds. Steady winds are also much better to fly in than gusty or spotty winds. On days when the windsock is bouncing every which way or confused winds where the gusts come at different angles than the steady winds it's much worse than a steady 10 or 12 down the runway.

PS - needed three clicks of left aileron but was otherwise nicely trimmed from the start.