You get what you pay for. Cheap stuff is always good to learn on, but do yourself and the rest of us a favor and use name brand quality stuff for the public. The warranty is only as good as the dealer/distributor network. If your "friend" stops selling it is there another distributor? Solar guard and Suntek have their own horror stories though some have good experiences with them. You might try solar FX or Express window films. They are good products and known to last. You don't see or hear anything bad about those two. Plus the distributors are great folks. @whitehog sells solar fx. Hope this helps.
