I have a L.G. 15' model - ran up on a deal a few years ago on woot.com and bought 3 (One for me, one for my Dad, and one for my then F.I.L.)
I will echo every single negative thing said about them here.
They are heavy, bulky, awkward, at full extension it flexes more than a standard ladder, etc...
BUT until you can show me another way to store a 15' straight ladder inside my 12' shed (or better yet a 7' step ladder inside ANY compartment on my parents RV) - then I'm going to stick with my L.G.
If you have the space to store them AND you plan to work with them frequently then buy yourself some lighter single purpose ladders. If you throw a ladder every once in a blue moon and/or you don't have a lot of storage space - the L.G. is the swiss army knife of ladders.