25 foot is the highest i go with an SLX pole....
any higher then its an xtreme 47....
SLX poles are heavy and very bendy when you get past 25 ft
I have an SLX 35 and it's usable in light to no wind, just.
30ft I'd say is the max for an SLX to do a good job.
Having said that and having used a similar length (extended length which is shorter than their advertised extended length) Ionics and Facelift poles, the SLX at the same height beats them hands down.