I have the Standard UCO Candle lantern & I love it.
I have the LED Base Add-on, the Flat Pack Reflector Add-on & the Neoprene Cocoon.
The Reflector makes a huge difference, normally there is a large shadow directly below the Lantern when it is hung(Think about it the candle itself will cause a shadow below it), adding the Flat Pack Reflector reduces this dramatically, it makes reading in a tent or in a hammock under a tarp much easier, as I mentioned above I also have the LED Base for my Lantern which is great, I actually prefer this for reading, it can come off and work as an independent Light it has a stand as well and can also function as a headlamp provided you have a strap, it simply replaces the base that comes with the lantern so it takes up no real extra room, honestly it seems silly not to have it.
So if your in the market buy a UCO Candle Lantern go for the one with the LED base, I got mine from thebushcraftstore.co.uk and it came with a nice fleece bag and a pack of 3 9 hour candles, which do actually last for at least 9 Hours.
I have the Neoprene Cocoon for it as well, while it does offer some protection it is more of a luxury than a necessity, if I had to choose between the Flat Pack Reflector or the Neoprene cover, The Reflector wins every time, it makes the lantern much more useful.
There are plenty of good reviews on Amazon.co.uk about both of these, and although I don't own the side reflector the majority of reviews I have read said it was a waste of money and added very little benefit, in fact one review I read said he had more success putting the UCO Candle Lantern in a cut open Beer Can than getting any benefit from the side Reflector..
Hope this Helps