Looks good, but I don't think there is enough new features for me to justify an u/g from Version 4.
But for anyone contemplating buying either 4 or 5 but still on the fence, I can heartily recommend them as they improve the level of awareness considerably. I find it great when flying circuits, just to look left (or right) and be able to keep the airfield in view for perfect landings. Much more immersive than thumbing a hat switch. And in combat (IL1946) it is invaluable, not sure if it fully supported in CFS2 & 3.