I can tell you that from a cold start, after the bypass, my trans still warms up to 70 degrees (the point at which the computer will let it shift into OD) at about the same point on the road as it did before the bypass. I had the Bully Dog installed for a while before I did the bypass and got the second cooler installed so I was able to do some comparison. I have a Bully Dog that I bought so I could monitor the Trans temp. That way the trans fluid doesn't even go to the coolers until the temp reaches 180 degrees. I also put in a Tru-Cool 180 degree thermal bypass valve in the trans cooler line. I do quite a bit of trailer towing, sometimes in the mountains where I use to over heat. I did the bypass and added a second cooler, a Tru-Cool. I also have a 2012 and the factory cooler is on the passenger/right side. The later models require a short length of about 2' of 5/16"/8MM transmission cooler hose that can be cut to size to run from the hose union at the left side of the radiator to the metal cooler line. The early models just require a simple re-routing of the hose. For those that insist on doing the bypass, be aware that the procedure for the 2008 and later model are a little different than pre-2008, because of the relocation of the auxiliary cooler from the passenger side to the driver's side of the vehicle. If you want to spend more money, they the all-aluminum, CSF radiator from Stillen at $350 is a nice choice just remember to cut the spring off of the radiator cap that comes with it or modify the Nissan cap to fit it. IMO, it doesn't make much sense to bypass when there is a relatively low-cost solution in replacing with an aftermarket radiator. It's only the original, factory installed, Calsonic (which is owned by Nissan) radiators that have had the cooler failure concerns.
The radiator in my 06 Pathy was a $92 Ebay unit made in China (where most radiators are made these days, regardless of whether they are name brand or not) that I installed seven years ago without any issues since.
I have yet to hear of one that has had a cooler fail in it (and keep in mind that I moderate or am an administrator at several Nissan sites and this problem has been going on a pretty long time). The vehicle already has an auxiliary cooler in the front of the A/C condenser which actually cools the trans fluid a bit too much when not used with the radiator's integral cooler, so adding a second auxiliary cooler doesn't make much sense, especially when the price of a quality, aftermarket, external trans cooler runs about the same price as an aftermarket replacement radiator.
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