~ I have run Macs on my boats for years both the 22 tender and the Lund. They knock a couple kts off your top end but not enough to matter. They work great and have saved me many a prop and more severe skeg damage over the years--That being said i have bent and busted Mac's as well from hitting deadheads, oyster beds, reef. but Mac's always made good and sent me replacements under warranty. I would highly recommend the Mac's if you're running shallow water with obstructions. Essential equipment for these waters.