If you know what you are doing, NoMar tire changers work just fine and without any need for any "sailor language". Breaking the beads without a NoMar or Weaver like machine is cuss worthy, and high risk of damaging a rim. But beyond that, knowing what you are doing makes the difference.
I can't vouch for the smaller NoMar tire changers, especially when it comes to mounting stiffer tires for our K1600's. But I do have a NoMar Professional model and it does not have me wishing I had a Weaver. I swapped out a set of knackered Dunlop RS3 for a set of RS4's on my carbon rims 2 weekends ago. As I alluded above, a NoMar or Weaver like machine is worth the price of admission for bead breaking alone, as breaking a bead using alternate methods is a serious pain in the butt and at great risk of damaging a rim - and that would be worthy of "sailors language". A NoMar or Weaver removes a tire from a rim in about the same amount of time - both a heck of a lot quicker than with tire irons. I always push the first bead over the rim by hand in seconds with no tools. With the stiffer tires our K1600's use, I personally use the NoMar to walk the first half of the second bead over the rim, then I prefer to flip the rest of the bead over with two tire irons and rim protectors while still mounted on the NoMar, while making sure the tire is fully in the wheel well (using clamps if needed). Part of that preference is because I don't want to take any chances with my carbon rims. The clamps and spoon work takes me all of a couple minutes and without stress to the rim. With plenty of lube, warming the tires, or mounting less stiff tires, there is no need to mess with tire irons or clamps.
Good luck finding a NoMar.