I have the regular 20-inch Stihl Rollomatic ES Bar on my MS400C. Is there a "real noticeable" difference in that bar and a 20-inch Rollomatic ES Lightweight Bar? I've never held a saw with a lightweight bar. Is it worth spending $160± on? I want to stick with a Stihl Bar, and I'd stay with another 20-inch bar, it's perfect for what I cut. If I could shed a little weight I wouldn't mind. Thanks, NYH1.