When pulling the XFX 9800 GTX+ out of the box and seeing the core speed displayed on the front, I wasn't 100% sure if it was stock or not. Just double checking, though, I quickly realized that it was overclocked. It was disappointing to see that XFX didn't make a bigger deal about the fact that it was overclocked, even though the shader and memory speeds remained the same.
With the memory and shader still running at stock speeds, we could see that the older 9800 GTX in a highly overclocked form could continue to beat the overclocked core of the 9800 GTX+ on offer from XFX.
For the most part you would probably be better off buying a second hand overclocked 9800 GTX off someone who has upgraded to a GTX 260 or GTX 280 and in the process saving some dollars.
It's not to say the XFX 9800 GTX+ isn't a good card, though. Really, their products come down to what NVIDIA offer and the simple fact is that the 9800 GTX+ is pretty boring. It's really only a step up from the 9800 GT or the 9600 GSO, which are exact replicas of previous generation cards.
Unless you were going to purchase an extremely overclocked 9800 GTX+, we would opt for a second hand 9800 GTX like we just mentioned.