Just installed mine yesterday. Took more than 2 hours, but I was taking my sweet time and made sure I was doing everything right. Also, I dropped one of the small white plastic clips from the stock parts down into the abyss of the engine bay and it took me a while to fish it out.
The most difficult part was removing the stock shifter bracket...I didn't have a battery terminal puller so I used sheer strength to get it off, didn't seem like it moved at all but in the end it finally came off.
The shifter is stiff at first but I can tell it's working in nicely already. The throws are significantly shorter and the feel is more mechanical...I'm really glad I bought this product.