So I finally broke down and installed one of the High Que grates in the green egg.
I have read everything about them on this forum. So I fired up the electric lighter and waited. At the start, did not seem to make a difference, then .. it started to warm up very quickly. I had to slow things down as I was doing a 250 deg cook. Then trying to speed things up due to lack of time, I opened the vents some more. Then it started to heat up quickly again. The fire becomes quite hot quickly.
So, in summary this thing works great. It does exactly what is advertised. My word of caution is that if you do buy one, keep an eye on your temperatures and the fire. Things change much quicker than you are use to.
Overall an excellent product and wish I had bought this as one of my accessories.