We must be talking about different kits, as the one I have is very light, one of the lightest glassworks I have ever seen. RTF weight depends on what cells you put in, so that's not particularly relevant
. I posted the empty weight of the kit on the first page.
The kit includes a very nice CD with over one hundred of challenged-proof pictures (see example below) and a nice video of the prototype, which seems to fly very well.
MiG-15 prototype video
(15 MB mpg)