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I installed the 55 12v and it is plenty strong. The added weight of a 24v system isn't worth it to me in my opinion. I use mine to troll for fish and it works great. In a huge ocean current it might take a while to get home, but it works decent as a backup. I carefully installed the puck on the bow under my rails. I used 4 screws and screwed right into it without needing any additional backing. Other members have posted pics of this as well. Depending on what you want this motor to do, I think you will be just fine with it. Plus it is always nice to have a backup. One will push my boat around 4-5 mph in smooth water.