1. It's a very good reel, very sturdy, handles hot hose with no problems. Very easy to reel in and out. The wind in handle is metal, but the outer cover on the end, the actual handle is plastic, and the tip of it is slightly damaged. Apart from that no problem, locking pin is handy too.
2. Yes you do need to prepare the floor. Depends on how dirty the floor is. Instructions are in the packet but here's a quick summary.
Make sure all debris are gone, sweep them up or out of the van. You'd be surprised what was under the plylining on my van from the previous owner.
Then, give it a good clean with flash or something (perhaps not necessary if your van is new)
Then use the scuff pad which is included in the protectakote kit, to roughen up the paint, so that the protectakote adheres better.
Then use the recommended xylene thinner to give it a final clean.
First layer should be quite thin. You need to wait between coats (can't remember exactly how long) so that's it's tacky, but dry enough, then another coat until no more white can be seen. Mine took 3 coats.
Then let it dry for 24 hours or longer.
3. I'm using Thermobore hose from Gardiner's, excellent stuff.
4. I've got a 2007 (new shape) Citroen Dispatch 2.0 HDI 120
Hope that helps.