Sierra_rider
Piss revver
I've almost completely switched over to lightweight bars. The only ones I haven't are my big bars that they don't even make lightweight versions of and my small 20"> bars. I do have a lightweight laminate narrow-kerf bar on my little 2511t and I was thinking about getting the same bar for my 201t.Well, LW bars have made a big impact in helping out with that achievement!Definitely more delicate than a Solid bar, but boy what a back saver!
Before I climb, I have the same internal debate about weight vs power with my top handles as I do when falling with my 70-80-90cc saws. It may sound silly, because the 201 is so light, but the 5ish lb 2511 saves so much energy in the tree compared to the 9ish lb 201. If I'm climbing conifers, I'll choose the 2511 every time. If I get into a broad oak, the decision is much more difficult. The 2511 requires finesse in hardwoods, while the 201 is like the 661 equivalent of a climbing saw.

I actually bought the 2511 early this year, just because I was dealing with bad tendonitis in my trigger elbow, so the lack of weight was appreciated.
Just compare your 661 to a 660 or even an 066. It's almost like the same comparison as the 462 to an 044/46. Except the 462 is actually considerably lighter than the 044/046.Very interesting! Man, power saws have really coming a long way in power to weight ratio!