Yes, that's what I've heard too. I had a pair ages and ages ago when they first came out and they stopped clearing well. They also turned yellow when they were clear.
I do sometimes think about trying them again though, as they have improved. I do remember the trouble Chris had over here and that's not something I'd want to have to deal with.
I usually keep my glasses for at least two years unless the frames break. The last two pair I've had have been very good and not broken. I got a new pair simply because I wanted them (frames, I mean). My prescription continues to change, and always has through the years. I can tell I need a new prescription as things at a distance are blurry again.
I'll check with the doc about the transition lenses. He's a fabulous doc so I can count on what he says.