Rightly so, its just a big waste of time and money. You will be hard pressed to feel any difference and most likely you will discover it has a messed up half shaft or gears. I cannot even believe you said it looks problem free. That is a bit ridiculous.
Well it does look problem free. The only think was a torn halfshaft boot which i replaced.... and i opened up the case and it looks fine. Also changed the fluid with OEM fluid.... I am just concerned i wont like it.