The low temp t-stat will allow the coolant to run 20-25 degrees cooler than the stock part, which lowers oil temps...a good thing in my book. The stock unit doesn't begin to open until the coolant temps reach around 186 degrees and is fully open at around 210, where the low temp opens at 160 and is fully open at 185. I've had mine for two summers now and the car runs much cooler.
http://www.lnengineering.com/lowtemperaturethermostat.html