Firstly I'm not an hot expert , nor on wfp. I've read yours posts and I think you have more practical knowledge than I do on the general topic.
That said I believe my hot system is better than anyone else's. The key is it's simplicity and extreme low cost.
The system needs a variflow attached (obviously) to the pump. This variflow has to be set very high, about 2-3 O'clock to achieve the flow rate required to light the main burner.This does use a lot of water. I try to use the hose tap to slow this down a bit.
I use minibore. The system/flow beahves no differently to a cold system. (I do not have a DI on the van).
I like the water hot, that's just my preference. I cracked a pane a few days ago, so now on some windows I have to turn it down.
Remember when you start it comes out cold and warms up over four or five windows. If I had to critisise my system I would say it use's a lot of water and my control of the actual water temperature is a bit crude. As more people adopt it though i'm sure little tips and tricks and better way's of doing things will emerge.
I can promise you this though NWH, twenty minutes after first using your own hot system you will never want to work cold again.