I can not account for how cheap, or anything like that, but i did see someone post a while ago about how LMS is way higher in cost, than the rest. If you think about it, they have the market cornered, and can charge what-ever they want but that be said it does seem that they put out a quality product; Minus there tunes for the 13'+, that everyone seems to be having trouble with.
In the end, they all function the same and spray meth. Tons of people with the unleashed kit, that seem to be doing just fine.