I have two (yes, two) of the Werner 22' MT MultiPurpose ladders.
Yes, it's heavy. But it's not that heavy -- if it's heavy enough to make you complain about it, you need to visit the gym some more. It's VERY stable. It's very good for serious work, even at full extension. And by serious, I mean that I've re-sided a house and done serious long-term work where I spent entire days up on this/these ladders. It's useful as a step-stool down lower, and it's useful as a super-long extension ladder that can reach the peak of my standard ranch house's gabled roofs.
I have two because I also have the scaffolding cross-piece, which I use when painting and doing other tasks where I don't want to move the ladder frequently and my hands will be busy with something else.
Personally, I buy for durability, which is why I have the metal ones. These are the ONLY two ladders I need -- the only other ladder-type thing I own is a step stool. Unlike Dad, who's got two fiberglass extension ladders and an array of metal or fiberglass stepladders.
I don't think I'd trust anything much lighter than the Werner MT ladders. I don't think I'd like the little plastic telescoping ones that fold down to nothing. I've seen "handymen" using them, but watching them wobble...