Thanks, guys!
I should have mentioned that I want gas. And while I like the idea of getting one capable of accepting attachments, I'd prefer to just have a dedicated pole saw.
If you have a low demand for a powered pole saw, may I suggest that you consider a high quality hand-powered pole saw. 10 years from now, you will still have a working unit, and you won't have to worry about the gas going stale, the batteries going bad, nor whether it will work when you need it.
Furthermore, a quality pole pruner will reach much higher and make better pruning cuts. My favorite saw was formerly Silky brand, but they quit making parts and new blades available in the USA, on account of lawyers and idiots that don't have enough sense to stay out of the utility wires.
In general, I'd say the Silky (when it was sharp) was easily less stress and strain to use for cutting a few branches than pulling out the Stihl power pruner. Even cutting a 4"-6" branch wasn't too much of a challenge, although the powered saws are
a lot better at making an undercut. What is a huge stretch and strain to reach with a 12' long powered pole saw is a casual job with a 21' long pole saw. You may even discover that you prefer to trim those problem branches when they are young and tiny, rather than letting them grow into big branches that require removal.
Even if you decide you must have an engine on your pole saw, you still need the pole saw. When that gas powered saw gets stuck, you need a backup plan for recovering it out of the tree. That means either climbing the tree, coming up with another long saw, or getting an aerial device or ladder.