Outstanding filament, goes down easy, prints like butter, love it. I print at 260 degrees on a 100 degree bed with 40 degree chamber temp. I use this filament exclusively on my current 3 year project as i have never had any issues or failures using it. The only issue I have had is trying to get hold of it as it isnt always in stock int the quantites I require, Otherwise would definately recommend just not the concrete grey as i need alot of it :)