Are bicycle tire liners good/worth it?

i love road biking and love going fast! but as soon as i get a flat i am doomed because i just can't do the install of a new tube and all that. on a mountain bike sure its easy but on a road bike its definitely more difficult i screwed up my hand once trying to replace it. anyways i went to bike shop today and... show more i love road biking and love going fast! but as soon as i get a flat i am doomed because i just can't do the install of a new tube and all that. on a mountain bike sure its easy but on a road bike its definitely more difficult i screwed up my hand once trying to replace it. anyways i went to bike shop today and guy recommended to me either get MEGA TUBE which is a lot thicker than ur normal bike tube or get mr tuffys tire liner. OR get BOTH and my tires will be bulletproof! lol. anyways it sounds good since a flat tire is my worst enemy but i read around online that it kinda weighs the bike down? will i really go that much slower? is it worth it? tell me ur thoughts/experiences/etc i wanna hear from you guys!
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