My XE has the HUD. It's perfect and well worth paying for it as an option. Clear display, even in bright sunlight. Displays current speed, traffic signs, nav guidance, current gear & cruise control settings.
I didn't take delivery of it, but I had the chance to sit in an XE which was fitted with HUD.
Seemed quite nice to me, though I didn't find the image perfectly focused - that's probably a matter of setting it up correctly for my size though.
One thing to note is that having the HUD fitted on the XE is adding some kind of plastic frame on top of the instrument panel.
You can see it on this picture :