Canon 70-300 IS USM vs 70-300 L IS USM

Thanks for the reply. I was hoping the non "L" version would be substantially better than my 55-250 and relative close to the "L" version. However, I suspect I'll have a problem.

Unfortunately it weighs 80% more than my walkaround 15-85 and more than 2.5 times my 55-250 lense.

And for sure it won't eliminate the 15-85.

I think I have to visit a camera store and try it out. I'm really concerned about the weight. As I wrote I'm not getting any younger and I'll be 69 on my next National Park (Glacier in Montana) trip this summer.