OK, pics of the other (Hatchbag) boot liner as promised!
This is the initial fit. As you can see, the liner covers the entire boot, all the way up to the rubber seals. It also goes right into the pockets at the sides (you can just make out my charging cable in the left hand pocket and first aid kit in the right). The bumper cover is folded up on the floor of the boot in this picture. The sticky back velcro is nearly all stuck to plastic, there are a few small bits stuck to carpet at the sides but they seem to be holding for now.
Here is another photo with the boot cover extended and the optional flap over the back seats fitted. This is the one bit I'm not 100% happy with. The other boot liner fitted around the headrest posts so was nice and flat over the back seats (with seperate covers for the headrests). This one goes over the headrests so doesn't hang very well and obstructs the already limited rear view even more. The hang is made worse by the fact I have removed the middle head rest (it obstructs the view and I'm never going to have a middle back seat passenger). What I will probably do is make holes in the this cover, fit it directly over the back seats and mount the headrests through the holes. I will also have to trim the length so it doesn't hang all the way down over the back seats. This will leave the headrests uncovered but this isn't an issue with my dogs and I could always use the headrest covers from the other boot liner if needed. You will also see I have put the padded foam bottom from the other boot liner in the bottom. Hatchbag do make their own mats but I already had this one and theirs are quite expensive.
Apart from the issue with the back seat cover, I'm really happy with this boot liner. I much prefer it over the Rhino liner but, like for like, it works out at about twice the cost. There is a lot of attention to detail, including clear bits where the boot lights are, so they aren't obstructed and vents in the liner where the vents in the car are.
Finally, the also make an optional lining for the inside of the tailgate but as that is all hard plastic on the i4 (so easy to clean) I decided not to get it.