Two speed reels allow you to operate the reel at two different retrieve ratios - one high and the other lower. The main purpose of low speed is that instead of a fast, low power, retrieve you can go into low and get a slow, high power, retrieve. This is where you want to be if you are fighting a big fish (tuna, marlin, sword, shark) and the fish goes deep and you cannot raise it. You then put the reel into LOW and crank away now being able to gain line where in high you could not. If you plan to load this reel with
light line low speed is going to be useless to you. I would not buy a 2 speed reel unless my intention was to put 50#, or higher, line test on it. Of course that's just my opinion but if you are never going to use the low speed feature why add something to the reel that can only break? Keeping things simple is often the best way to go. Harry