Nice one geekay. I hope it works for you.
Mine was very stiff to slide into the slots at first, but having had it on the bike and fiddled with it a bit (this is sounding worse and worse!), I found it has freed up somewhat and slides a bit more easily now. I wouldn't adjust it while moving, but can pull over, flip up the two latches, adjust it, latch it back down and be off again without taking off my gloves.
It doesn't seem to flex/view rate a little at motorway speed though, and I am looking over it rather than through. I might try adjusting it higher just to see what it's like to look through.
I've also read somewhere about dangers of leaving after market screens exposed to direct sunlight ast Hello tend to have a magnifying effect and can heat/warp the dash. I'm not sure if it was the givi as I can't remember where I read this, but solutions like putting a cloth between on really hot days or buying a shelf for accessories to sit between the screen and the dash.
I'd be interested to hear how you get on with the screen and what adjustment works best for you.