I use Horizon GenerationX VFR photographic scenery for England and Wales (I'll soon be adding Scotland when total coverage is achieved). Not sure if that is the VFR scenery you are refering to, but with just a few well published tweeaks to the FSX.cfg file, the scenery is very sharp. It does help to have the photographic scenery files on a fast drive so that they load in quickly as you fly from one tile to another. It also is more realistic to have the visibility settings down to about 60 miles or so. It is not realistic, at all, to be able to see a totally clear sky with no haze on the horizon flying in the UK. Any reduction in the detail that the computer has to process at distance is going to help it resolve the "blurries" problem close up!
As far as the "... lack of autogen or anything at all 3D for miles around is (unless at height) rather strange looking..." problem is concerned, I have Treescapes from Earth Simulations installed, Which has trees planted in the right places. Coupled with the UK2000 airfield scenery and others, I get very realistic VFR flights with the ability to actually navigate by the ground imagery, as depicted on the actual charts, which is what it's all about.
I calculated that with the purchase of VFR GenX for Ireland and for Scotland and Treescapes for Scotland (I already have Scotflight airfield sceneries) My total outlay for complete coverage of the UK will be about £200.
I bet the ORBX sceneries when they arrive will be more than that plus the fact the scenery is landclass based and not be an accurate representation of what you would see in real life.
Rusty Lock wrote:
...whereas the 'flat-satellite-images-on-3D-terrain' addons, that began a few years ago was all but useless - in my opinion - as it lacked most features you'd consider whilst route planning with a VFR chart, whereas OrbX include things you'd expect to keep an eye out for...
Total Rubbish!

Have you flown VFR at 2000 to 3000ft with photographic scenery in the UK? The photography is taken from aircraft not satellites and most of it now is 60cm/pixel and there are literally hundreds of free VRP and VFR landmark scenery addons for navigating by available for download off the net.
Just my opinion!
Ted