I have a cs590 with a 28 inch bar professional chain. On MY bathroom scales it's 19 pounds fully loaded ready to cut. My CS 490, 14 lbs ready to go same as the Sthil 026. The Sthil 028 with my set up is just a tiny bit (2) lbs lighter than the cs590.
Today I was going to flush cut a 30 inch Stump before I grind it. Accidentally picked up the cs490 instead of the 590 the boxes look alike. Got to location opened saw box, saw that tiny saw and changed the word Oh-Sh to Oh Well and decided ti try the 490 anyway. The 20 inch bar slid right into the wood and disappeared. I swept it almost through, tossed in a wedge and moved to the side started cutting, tossed in another wedge and swept the bar clear. The saw wasn't anything as fast as the 590 nor the Sthil 029 but it never bogged not hesitated. I was blown away. Now I like the cs490 much more than before. It keeps impressing me.