I still prefer the telescoping mirror because there is no bending over involved. My thought is if you have to bend over, you might end up leaning the bike a bit and in doing so, not getting an entirely accurate read.That's what I do. Actually, any old mirror will do. I have a small one my wife gave me and I keep it in my riding jacket. I still would prefer a good ole dipstick to this window idea. Now, the question is, how do you check the coolant level? The manual says to look in it's window but, there's a cover on it. The only way I can think of is to remove the cover. Just a minor pain in the backside.
About checking coolant, yup, remove the cover.