Oddly enough, this is the third transmission fluid thread in just a few days, but all were asking something a little different. I posted replies in the other two threads so this is somewhat of a repeat.
My logic is, on a Versa four speed drain and fill, you use four quarts, Buying fluid off the shelf at a parts store might save you 2 - 4 bucks a quart over the manufacturer's fluid. So you save maybe $10 - $20. Consider the cost a transmission failure, it is probably somewhere around $2000 - $4000. The cost to risk ratio just doesn't make sense to me. Manufacturers select a fluid formulation based on the materials within the transmission and the performance specs of the fluid to work correctly. I don't have more knowledge than the Nissan Engineers that decided on the fluid formulation for that transmission. Others report (short term) success with other fluids, so my logic may be completely off base. I say short term, because our Versa's aren't that old, and using a wrong fluid may not show up as a problem until miles or years down the road. Even then, it would be difficult to establish cause and effect.
Like wn1998, I change the fluid once a year. Super easy. Nissan fluid costs a total of $30 for four quarts.