I love the Beefy-T, and I love this too.
I picked this one up in Charcoal Heather, which is darker than I wanted, but I only picked up two of them to test how I like them, and I am fine with the color.
They fit true to size.
I like the same color across all of my shirts, which is a Heather Grey, and some of the grey's on the computer screen just don't get me close enough to tell the differences.
So, if you are looking for greys, Heather Grey and Light Steel are about the same color.
In fact, I just looked over my last order, I picked up some Comfort Soft Polo's, Short Sleeve Beefy-T's, a pullover Hoodie and a zip up Hoodie and all four are "Light Steel" which I think of as Heather Grey (a color not listed on the short sleeve or long sleeve Beefy-T, but Light Steel is what you want! - same for the Hoodie's)
The long sleeve version is an excellent shirt, and I love them, even in the darker color... I'll pick up the Light Steel ones on my next order.