It depends on what your comfortable with and what you have flown in before either on your own or with an instructor. Ive been up in a Raven 2 35kts gusting 50kts and it wasn't particularly nice - needless to say the flight didn't last that long and our landing site was nice and sheltered.
Gusty wind versus steady wind is always an issue. Low G may result in gusty conditions as the helicopter climbs and drops - so flying slowly at a reduced pitch is always a good bet.
Passengers, especially those who haven't flown much before, wont like it very much in 20kts with a gust spread up to 35kts.
Gusts up towards 40kts can result in the blades flapping significantly at low RPM which could result in a tail boom strike.
There is something in the flight manual that states maximum wind speeds you should be flying in if you have less than 200 hours in robos but i dont have a copy to hand and wouldnt want to misquote.
At the end of the day - if you're flying for pleasure - you dont have to be in poor conditions in the first place.