i think all those points above are correct and very constructive critisism of both kits.
i would just like to add to john's explanation in that a full kit , as john and others say, contains everything for building except glues paints and motors, whereas in a semi kit, you usually have to buy in such things as wood for decking[not the lifeboats though] and materials such as brass for rails and such, thread plastics in some ircumstances etc.also with speedline, there are usually no plans for the boat, and you have to contact the RNLI in poole for these things, which all add to the price, but also to the research..then there are the photos of the exact boat you want to build, more expense if you can't find a friendly hon sec[ DLA, as they are now called] or a nice crewman to take hundreds of photos for you.
so there you are.....a full picture for you to think about.
neil.