Ls swap opinion

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As time has went by, I have noticed that it would seem more folks are going this route vs rebuilding there given engine. I have also noticed that some guys while doing their build thread, have been replacing a given engine with an ls model. Also that the engine they had in some cases, didnt have a problem while others were going to have to rebuild/ replace anyway. All this has lead me to ask what reason(s) any of you that have been down this path had? I'm sure some will say they were getting poor fuel mileage and now it's almost double. For others it just may have been they wanted to simply try this engine out. I wanted any and all feedback on not only any reason but now that its done how do you like the change? What are the cost involved? I like the idea of any benefit it has but just for the guys who havent done it and may be on the fence what are we in for? Better mileage?, longer service life of the engine? Etc..Thanks in advance for any feedback.