They work fine. If you must run them along side the boat to make sure. Or, if your a total lunatic like I was, setup the bath tub for a test.
Things is most modern Lures are designed for multi-speeds. Most of all jointed ones, like Rapalas. The trick is to not exceed their maximum speed, front trebel or no front trebel. The front hook really has nothing to do with it. Of course once you are hooked up and patterning the fish, while trolling, you'll want to repeat everything you did to catch the fish. Including lure type, color, troll speed, type/location of structure where you caught the fish.
At times fish will hit a bait at 1.6 mph, other times 2.2 mph. Other times it dont matter. Almost at all times changing speeds and figure 8'ing will induce a strike. Walleye in particular are notorious for following a bait. But there is a max speed for each type of lure.
Think about it? When was the last time you caught a fish and needed the front trebel? They are nothing but weed catchers. Besides many Lures allow you to adjust the action of the lure.