FWIW, I use the Magfloat. They come in various sizes. It works great and when the pads wear out, you can just replace the pads without buying a new float.
But yes, they are noticable and as such, I don't leave it in the tank.
*Substrate = 50% Florite sand 50% regular Florite
*Lighting 108W of a 216W T5HO Aquatic Life hood 25" from substrate 8.5 hours daily.
*Amarath Redroot, Waterhyssop, Brazilian Pennywort, Water Wisteria, Jungle Val, Moss Ball, Riccia, Nana, Java Lace, Cryptocoryne, Pigmy Chain Sword.